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Open Source Alternatives to Popular Software

Over 1 million users replaced their proprietary tools with open source software. Discover the best alternatives and join the movement.

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Bright Data
Windshift
Openlane
Docmost
InfluxDB
Capture
CodeRabbit
Postiz
c15t
Sent

Campfire

Self-hosted group chat without recurring subscription fees

  • Stars

    Stars growing over the last 30 days4,804

  • Last commit

    2 days ago

  • License

    MIT
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Open Source Alternative to:

Microsoft Teams

Plunk

The open-source, affordable email platform

  • Stars

    5,546

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Plunk unifies marketing, transactional, and broadcast emails into a single, complete solution for businesses of all sizes.

Open Source Alternative to:

Resend

Requestly

Intercept, modify, and debug HTTP(S) requests effortlessly

  • Stars

    6,755

  • Last commit

    13 hours ago

  • License

    AGPL-3.0
A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Open Source Alternative to:

Postman

Zabbix

Enterprise monitoring for networks, apps, and infrastructure

  • Stars

    6,511

  • Last commit

    3 days ago

  • License

    AGPL-3.0
Monitors networks, servers, cloud services, IoT, and OT environments with no per-device licensing fees, available self-hosted or as a managed SaaS platform.

Open Source Alternative to:

DataDog

BleachBit

Clean your system and free disk space

  • Stars

    Stars growing over the last 30 days7,251

  • Last commit

    7 hours ago

  • License

    GPL-3.0
BleachBit frees disk space & protects privacy by deleting cache, cookies, history & temp files from Firefox, Chrome & more. Open source for Linux/Windows.

Open Source Alternative to:

CCleaner

Flagsmith

Feature flags and remote config for rapid deployment

  • Stars

    6,622

  • Last commit

    4 hours ago

  • License

    BSD-3-Clause
Powerful feature management platform for seamless software releases, A/B testing, and personalized user experiences.

Open Source Alternative to:

LaunchDarkly

UnKey

Secure, scalable API key management for developers

  • Stars

    5,480

  • Last commit

    4 hours ago

  • License

    AGPL-3.0
Streamline API authentication with UnKey's powerful, developer-friendly platform for creating, revoking, and monitoring API keys.

Open Source Alternative to:

Kong

Vikunja

Organize, collaborate, and conquer your tasks

  • Stars

    Stars growing over the last 30 days5,866

  • Last commit

    4 hours ago

  • License

    AGPL-3.0
A powerful, open-source task management platform for teams and individuals, offering customizable workflows and seamless integration.

Open Source Alternative to:

Linear

OpenStack

Open source cloud infrastructure trusted at massive scale

  • Stars

    6,069

  • Last commit

    4 hours ago

  • License

    Apache-2.0
OpenStack manages compute, storage, and networking across VMs, bare metal, and containers via APIs or a dashboard. Trusted by Walmart, China Mobile, and more.

Open Source Alternative to:

Amazon Web Services

OpenShot

Free, cross-platform video editor that's easy to learn

  • Stars

    6,693

  • Last commit

    18 hours ago

  • License

    GPL-3.0
A free, open-source video editor for Linux, Mac, and Windows with animation, effects, multi-track editing, and 3D title rendering.

Open Source Alternative to:

CapCut

Apache Pinot

Distributed OLAP database for real-time analytics at scale

  • Stars

    6,169

  • Last commit

    4 hours ago

  • License

    Apache-2.0
Sub-second SQL queries on fresh streaming data at petabyte scale, built for high-concurrency user-facing apps and AI agent backends.

Open Source Alternative to:

Splunk

Standard Notes

Secure, encrypted notes for your digital life

  • Stars

    6,681

  • Last commit

    3 days ago

  • License

    AGPL-3.0
Cross-platform note-taking app with end-to-end encryption, offline access, and powerful organization features for privacy-conscious users.

Open Source Alternative to:

Obsidian

Permify

Build scalable authorization in minutes, not months

  • Stars

    5,966

  • Last commit

    4 days ago

  • License

    AGPL-3.0
Open-source authorization service for implementing fine-grained access controls. Centralized, scalable solution supporting RBAC, ABAC and ReBAC with Google Zanzibar-inspired architecture.

Open Source Alternative to:

Auth0

ezBookkeeping

Lightweight self-hosted bookkeeping with AI receipt scanning

  • Stars

    Stars growing over the last 30 days5,838

  • Last commit

    6 hours ago

  • License

    MIT
A privacy-first personal finance app with two-level accounts, multi-currency support, AI receipt recognition, and broad data import from formats like GnuCash and Firefly III.

Open Source Alternative to:

YNAB

Weblate

Continuous web-based localization for global reach

  • Stars

    6,130

  • Last commit

    4 hours ago

  • License

    GPL-3.0
Web-based continuous localization platform with version control integration, quality checks, and clean interface. Used by 2,500+ projects in 165+ countries.

Open Source Alternative to:

Crowdin

Inngest

Effortless event-driven workflows for modern applications

  • Stars

    5,991

  • Last commit

    4 hours ago

  • License

    SSPL-1.0
Simplify backend processes with event-driven functions, seamless integrations, and powerful debugging tools for developers.

Open Source Alternative to:

Kafka

Agenta

AI
Build, automate, and improve AI agents with your team

  • Stars

    4,862

  • Last commit

    4 hours ago

  • License

    MIT
Open-source workspace for building and running AI agents: chat-driven development, scheduling, human-in-the-loop approvals, versioning, and tracing. Self-host or use the cloud.

Open Source Alternative to:

ChatGPT Work

Kener

Deploy a professional status page in minutes, no coding required

  • Stars

    5,221

  • Last commit

    15 hours ago

  • License

    MIT
Free, open-source status page and uptime monitor with Docker deployment. Track 11 service types, manage incidents, schedule maintenance, and notify subscribers instantly.

Open Source Alternative to:

DataDog

GIMP

Professional image editing without the price tag

  • Stars

    6,546

  • Last commit

    4 hours ago

  • License

    Unknown
Free, open-source image editor with professional tools for photo manipulation, digital art creation, and graphic design. Cross-platform support.

Open Source Alternative to:

Adobe Photoshop

Fathom Lite

Privacy-focused analytics without the complexity

  • Stars

    8,032

  • Last commit

    7 months ago

  • License

    MIT
A simple, privacy-first analytics platform that provides valuable website insights without compromising visitor data or requiring cookie consent banners.

Open Source Alternative to:

Google Analytics

useSend

Pay per email sent, not for contact storage

  • Stars

    4,758

  • Last commit

    23 hours ago

  • License

    AGPL-3.0
Open source email platform for transactional and marketing emails. Self-host or use cloud service with transparent pricing - pay only for emails sent.

Open Source Alternative to:

Resend

Latitude

AI
Full observability for AI agents in production

  • Stars

    4,735

  • Last commit

    6 hours ago

  • License

    MIT
Open-source platform for monitoring AI agents: captures traces, surfaces failure patterns, alerts on issues, and helps you verify fixes with automated evals.

Open Source Alternative to:

LangSmith

LangWatch

AI
Simulation-based testing and evaluation for AI agents

  • Stars

    4,992

  • Last commit

    4 hours ago

  • License

    Apache-2.0
Tests AI agents through multi-turn simulations, LLM-based scoring, and production tracing so teams can ship reliable agents with confidence.

Open Source Alternative to:

LangSmith

Frappe CRM

Open-source CRM that puts simplicity and control first

  • Stars

    Stars growing over the last 30 days3,861

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
A flexible and customizable CRM platform for managing contacts, deals, and customer relationships without the complexity or user-based pricing of traditional solutions.

Open Source Alternative to:

Salesforce

ACI.dev

AI
Build reliable AI agents with unified tool integration

  • Stars

    4,924

  • Last commit

    3 days ago

  • License

    Apache-2.0
Platform for connecting AI agents to 500+ tools with built-in multi-tenant auth management and granular permissions using either function calling or a unified MCP server

Open Source Alternative to:

Pipedream

Passbolt

Secure password management for teams

  • Stars

    6,189

  • Last commit

    6 days ago

  • License

    AGPL-3.0
Open source password manager focused on security, collaboration and privacy for organizations

Open Source Alternative to:

1Password

Digger

Terraform automation with pull request workflows

  • Stars

    5,058

  • Last commit

    4 days ago

  • License

    MIT
Open-source CI/CD orchestrator for Terraform with pull request automation, drift detection, and enterprise-grade security. Self-hostable with private runners.

Open Source Alternative to:

Spacelift

Zammad

Powerful helpdesk solution for streamlined customer service

  • Stars

    6,031

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
Zammad is an open-source helpdesk software that centralizes customer communications and helps deliver great service experiences efficiently.

Open Source Alternative to:

Open

Solidus

Flexible eCommerce platform for brands that stand out

  • Stars

    5,345

  • Last commit

    5 hours ago

  • License

    BSD-3-Clause
Open-source eCommerce platform offering customization, scalability and enterprise-grade features for brands of all sizes

Open Source Alternative to:

Shopify

Waterfox

Privacy-first browser built for power users

  • Stars

    6,398

  • Last commit

    6 hours ago

  • License

    Unknown
Firefox-based browser with built-in ad blocking, oblivious DNS, zero telemetry, tree-style tabs, and no AI features sending your data anywhere.

Open Source Alternative to:

Firefox

Countly

Comprehensive analytics for data-driven decisions

  • Stars

    5,922

  • Last commit

    4 hours ago

  • License

    Other
All-in-one analytics platform for mobile, web, and desktop apps. Track user behavior, monitor performance, and optimize your product.

Open Source Alternative to:

Google Analytics

FleetBase

Open source modular logistics platform for faster app development

  • Stars

    Stars growing quickly over the last 30 days4,407

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Fleetbase is a comprehensive open source logistics suite offering API, TMS, driver and customer apps for streamlined operations and development.

Open Source Alternative to:

Shipsy

Pipeshub

AI
Enterprise workplace AI with data you own and control

  • Stars

    3,850

  • Last commit

    4 hours ago

  • License

    Apache-2.0
Self-hostable enterprise AI platform that unifies business data across apps, powers a knowledge graph for cited answers, and lets teams build AI agents across their stack.

Open Source Alternative to:

Glean

OSMAnd

Navigate anywhere with detailed offline maps and GPS

  • Stars

    6,111

  • Last commit

    4 hours ago

  • License

    Unknown
Comprehensive offline navigation app with detailed maps, turn-by-turn guidance, and specialized routing for hiking, cycling, and walking worldwide.

Open Source Alternative to:

Google Maps

Kdenlive

Professional video editing without the price tag

  • Stars

    Stars growing over the last 30 days5,938

  • Last commit

    7 hours ago

  • License

    GPL-3.0
Cross-platform non-linear video editor offering professional features for free. Edit videos on Linux, Windows, macOS, and BSD with advanced tools and effects.

Open Source Alternative to:

CapCut

Mathesar

Spreadsheet-like interface for PostgreSQL databases

  • Stars

    5,163

  • Last commit

    9 hours ago

  • License

    GPL-3.0
A self-hosted tool that provides an intuitive, spreadsheet-style interface for viewing, editing, and querying PostgreSQL databases without technical expertise.

Open Source Alternative to:

Airtable

Logfire

AI
Powerful observability made simple for developers

  • Stars

    4,523

  • Last commit

    5 hours ago

  • License

    MIT
Logfire offers intuitive observability tools for Python applications, combining logs, profiling, and telemetry in one platform.

Open Source Alternative to:

DataDog

Inkscape

Professional vector graphics editor for all skill levels

  • Stars

    4,017

  • Last commit

    4 hours ago

  • License

    Other
Cross-platform vector graphics editor with flexible drawing tools, Bezier curves, powerful text handling, and broad file format support for illustrators and designers.

Open Source Alternative to:

Figma

Rallly

Effortless group scheduling for seamless collaboration

  • Stars

    5,323

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
A user-friendly, open-source tool for coordinating events and meetings without the hassle of back-and-forth emails or messages.

Open Source Alternative to:

Calendly

Jitsu

Open-source data integration for modern stacks

  • Stars

    5,116

  • Last commit

    7 hours ago

  • License

    MIT
Collect, transform, and sync data across your entire infrastructure with a flexible, code-based approach to data integration.

Open Source Alternative to:

Segment

Kimai

Effortless time tracking for teams and projects

  • Stars

    5,100

  • Last commit

    15 hours ago

  • License

    AGPL-3.0
Open-source time tracking solution for businesses of all sizes. Manage projects, track billable hours, and generate insightful reports.

Open Source Alternative to:

Clockify

Easy!Appointments

Free open-source appointment booking for any business

  • Stars

    4,461

  • Last commit

    7 hours ago

  • License

    GPL-3.0
Self-hosted appointment scheduling solution with Google Calendar sync, customizable workflows, and no monthly fees. Perfect for healthcare, salons, and service businesses.

Open Source Alternative to:

Calendly
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