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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Modern command-line HTTP client for the API era
Stars
4,037Last commit
1 year agoLicense
BSD-3-Clause
Intuitive, user-friendly CLI tool for making HTTP requests, debugging APIs, and testing web services with ease and efficiency.
Open Source Alternative to:
Modern open-source billing platform for hosting businesses
Stars
2,300Last commit
14 hours agoLicense
MIT
Automate subscriptions and manage payments with a flexible, open-source billing system designed specifically for hosting providers.
Open Source Alternative to:
Smart task management for individuals and families
Stars
2,550Last commit
27 days agoLicense
AGPL-3.0
Organize tasks and chores with intelligent scheduling, fair assignment, and collaboration features. Perfect for families and teams with smart notifications.
Open Source Alternative to:
Get audit-ready for SOC 2, ISO 27001, HIPAA, and GDPR
Stars
1,958Last commit
6 days agoLicense
AGPL-3.0
AI-driven compliance platform that automates evidence collection, policy generation, and continuous monitoring across 580+ integrations for SOC 2, ISO 27001, HIPAA, and GDPR.
Open Source Alternative to:
Free DNS management and URL shortening platform
Stars
2,281Last commit
3 days agoLicense
MIT
WR.DO offers free domain name distribution and short URL generation, built on Cloudflare's infrastructure for reliability and speed.
Open Source Alternative to:
Create engaging product tours and user onboarding experiences
Stars
2,304Last commit
16 hours agoLicense
AGPL-3.0
Open-source platform for building interactive product tours, tooltips, and in-app guides to improve user engagement and feature adoption without complex coding
Open Source Alternative to:
Decentralized social network for book lovers and readers
Stars
2,780Last commit
1 day agoLicense
Unknown
Join a federated social reading platform where you can track books, write reviews, discover recommendations from friends, and connect with trusted reading communities.
Open Source Alternative to:
Route GenAI traffic with confidence using open source
Stars
2,068Last commit
5 hours agoLicense
Apache-2.0
Open source gateway built on Envoy for routing application traffic to GenAI services. Supports 16+ LLM providers including OpenAI, Anthropic, AWS Bedrock.
Open Source Alternative to:
AI agents that transform merchant risk decisions at scale
Stars
2,429Last commit
5 days agoLicense
Unknown
Reduce fraud, accelerate underwriting, and maintain compliance with AI-driven merchant risk intelligence for PSPs, banks, and fintechs.
Open Source Alternative to:
Self-hosted email platform with visual editor & analytics
Stars
2,197Last commit
1 day agoLicense
AGPL-3.0
Free open-source email platform for newsletters and transactional emails. Self-hosted alternative to Mailchimp with visual MJML editor, A/B testing, and analytics.
Open Source Alternative to:
Blazing-fast API gateway with linear scalability
Stars
2,682Last commit
10 hours agoLicense
Apache-2.0
High-performance, stateless API gateway built for microservices. Handle 80K+ requests/second with transparent pricing and enterprise-grade reliability.
Open Source Alternative to:
Open canvas for designing and building web apps
Stars
2,637Last commit
6 hours agoLicense
Apache-2.0
Design and build web applications on an open canvas with AI-powered tools, Figma integration, pixel drawing, and a modular SDK built for extensibility.
Open Source Alternative to:
Create beautiful images of your code
Stars
2,355Last commit
6 days agoLicense
MIT
Turn your code into beautiful images. Choose from a range of syntax colors, hide or show the background, and toggle between a dark and light window.
Open-source personal finance management tool
Stars
2,922Last commit
4 months agoLicense
GPL-3.0
Self-hosted alternative to Mint and YNAB for budgeting and building wealth while maintaining full control of your financial data.
Open Source Alternative to:
Self-host your digital life with ease
Stars
2,977Last commit
8 hours agoLicense
AGPL-3.0
Install and maintain your own server with minimal technical knowledge. Host websites, email, cloud storage, social networks, and more for complete digital independence.
Open Source Alternative to:
Design, prototype, and test user experiences with ease
Stars
2,712Last commit
5 hours agoLicense
GPL-3.0
Quant-UX is an open-source tool for creating interactive prototypes, conducting user tests, and analyzing results to improve UX design.
Open Source Alternative to:
Code with Claude, Codex, Gemini, and more in one workspace
Stars
1,798Last commit
5 hours agoLicense
MIT
Desktop coding workspace that connects to AI subscriptions you already have, with parallel agents, worktrees, one-click PRs, and multi-project management.
Open Source Alternative to:
Complete IT infrastructure monitoring made simple
Stars
2,366Last commit
5 hours agoLicense
GPL-2.0
Monitor your entire IT infrastructure with 2,000+ plugins, automated discovery, and scalable architecture. Open source and enterprise solutions available.
Open Source Alternative to:
Serverless team chat over Tor, no phone number needed
Stars
2,648Last commit
6 hours agoLicense
GPL-3.0
Quiet is a peer-to-peer messaging app that syncs messages directly between devices over Tor, with no central server, no phone number required, and no metadata leaks.
Open Source Alternative to:
Build privacy-compliant cookie banners with full control
Stars
1,891Last commit
6 hours agoLicense
Apache-2.0
Open source consent management framework for modern web apps. Framework-agnostic, fully customizable, and performance-first with no vendor lock-in.
Open Source Alternative to:
Real-time usage metering and billing for AI companies
Stars
2,275Last commit
9 hours agoLicense
Apache-2.0
Open source billing platform that turns events into revenue with real-time metering, usage limits, and flexible pricing. Integrates with Stripe, CRMs, and payment providers.
Open Source Alternative to:
Powerful, customizable web analytics for your site
Stars
2,688Last commit
7 hours agoLicense
GPL-2.0
Open-source web analytics platform offering comprehensive visitor tracking, customizable dashboards, and data ownership for websites and applications.
Open Source Alternative to:
Navigate anywhere offline with complete privacy
Stars
2,069Last commit
12 hours agoLicense
Apache-2.0
Offline navigation app for hiking, biking, and driving. No tracking, no data collection, community-driven maps. Works without internet connection.
Open Source Alternative to:
Turn bare metal into intelligent cloud infrastructure
Stars
2,223Last commit
5 hours agoLicense
Apache-2.0
Transform bare metal servers into a complete cloud platform with REST API for Kubernetes clusters, databases, VMs, and load balancers. Build your own cloud.
Open Source Alternative to:
Comprehensive open-source HR management solution
Stars
1,420Last commit
16 hours agoLicense
LGPL-2.1
Horilla is a free, open-source HRMS that streamlines HR processes, from recruitment to offboarding, with customizable modules.
Open Source Alternative to:
Simplify AWS SES email management with ease
Stars
2,307Last commit
3 months agoLicense
MIT
A comprehensive platform for managing transactional and marketing emails through AWS SES, featuring customer data management, SMS capabilities, and workflow automation.
Open Source Alternative to:
OpenTelemetry observability with traces, logs, and metrics
Stars
1,777Last commit
5 hours agoLicense
Unknown
Observability platform built on OpenTelemetry and ClickHouse. Collect, visualize, and query distributed traces, logs, and metrics, with an MCP server for AI agent diagnostics.
Open Source Alternative to:
Data observability for modern data teams
Stars
2,408Last commit
10 hours agoLicense
Apache-2.0
Elementary provides dbt-native data observability to detect issues, understand root causes, and resolve problems quickly in data pipelines.
Open Source Alternative to:
GPU orchestration across clouds, Kubernetes, and on-prem
Stars
2,249Last commit
13 hours agoLicense
MPL-2.0
Unified control plane for AI compute that provisions and schedules GPU workloads across any cloud, Kubernetes cluster, or bare-metal server.
Open Source Alternative to:
Real-time stream processing made simple and affordable
Stars
2,259Last commit
5 days agoLicense
Apache-2.0
Timeplus is a lightweight, powerful, and cost-efficient stream processing platform for real-time analytics, deployed as a single binary.
AI-native CRM/ERP foundation with 80% already built
Stars
1,730Last commit
6 hours agoLicense
MIT
A modular CRM/ERP framework built on Next.js and TypeScript that encodes hundreds of architectural decisions so dev teams can ship production features in days, not months.
Open Source Alternative to:
Local-first, offline-first no-code database platform
Stars
2,977Last commit
1 year agoLicense
AGPL-3.0
Build and manage custom databases with ease, create type-safe APIs, and develop applications quickly
Open Source Alternative to:
Self-hosted error tracking for full control and scalability
Stars
2,070Last commit
2 days agoLicense
Unknown
Bugsink offers real-time error tracking with self-hosting capabilities, allowing easy installation and connection to any app using Sentry-compatible SDKs.
Open Source Alternative to:
Unified API development ecosystem for modern teams
Stars
2,610Last commit
6 months agoLicense
AGPL-3.0
All-in-one platform for API testing, documentation, and collaboration, simplifying the entire API development lifecycle.
Open Source Alternative to:
Build your custom learning academy in minutes
Stars
1,685Last commit
8 hours agoLicense
AGPL-3.0
Open source LMS designed for companies and training organizations. Create, manage, and deliver courses with AI support, customizable dashboards, and collaborative features.
Open Source Alternative to:
Open-source CRM toolkit for personalized solutions
Stars
1,254Last commit
9 hours agoLicense
MIT
Build a customizable CRM that matches your company's vision, designed for developers and loved by end users.
Open Source Alternative to:
Open-source file storage with complete data sovereignty
Stars
1,768Last commit
15 hours agoLicense
AGPL-3.0
Secure, open-source platform for file storage, sharing, and collaboration. Host your data on your own infrastructure with full control and transparency.
Open Source Alternative to:
Business rules engine with AI, visual flows, and audit trails
Stars
1,985Last commit
20 days agoLicense
MIT
Model business logic in decision tables, visual flows, and natural-language rules. Change rules without deploys, test every path, and run the same engine anywhere.
Open Source Alternative to:
Open source monitoring for complex IT infrastructure
Stars
2,237Last commit
4 days agoLicense
GPL-3.0
Monitor networks, servers, and cloud environments with flexible open-source solution. Custom checks, fast alerts, and complete infrastructure control.
Open Source Alternative to:
Simplify your workflow with offline Kanban boards
Stars
2,026Last commit
1 day agoLicense
GPL-3.0
Kanri is a free, open-source personal Kanban app that works offline, offering a modern and simple experience while respecting your privacy.
Open Source Alternative to:
Self-hosted CRM with built-in AI chat and agent tools
Stars
1,653Last commit
5 hours agoLicense
AGPL-3.0
Open-source CRM with a built-in AI assistant, 37 MCP tools for external agents, custom fields, role-based permissions, and a REST API. No per-seat pricing.
Open Source Alternative to:
Open-source email marketing for the privacy-conscious
Stars
2,210Last commit
9 days agoLicense
AGPL-3.0
Self-hosted newsletter platform with powerful features, data protection, and full control over your mailing lists and campaigns.
Open Source Alternative to:
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c15t – Open-source cookie banner, built for control and lightening fast modern web apps.
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