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Open Source Projects using Next.js

A curated collection of the 205 best open source software using Next.js. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

Mage

AI
Magical data pipeline tool for seamless transformations

  • Stars

    8,841

  • Last commit

    13 days ago

  • License

    Apache-2.0
Open-source data pipeline platform for effortless data integration, transformation, and orchestration using Python, SQL, and R.

Open Source Alternative to:

AWS Step Functions

NHost

Serverless backend platform for modern app development

  • Stars

    9,376

  • Last commit

    9 hours ago

  • License

    MIT
Fully managed backend infrastructure with built-in authentication, database, storage, and serverless functions for rapid application development.

Open Source Alternative to:

Supabase

Highlight

Real-time observability for modern web applications

  • Stars

    9,386

  • Last commit

    13 days ago

  • License

    Apache-2.0
Comprehensive monitoring solution offering error tracking, session replay, and performance insights for seamless debugging and optimization.

Open Source Alternative to:

DataDog

Builder

Visual development platform for modern web experiences

  • Stars

    8,884

  • Last commit

    24 hours ago

  • License

    MIT
Drag-and-drop interface for creating and optimizing digital experiences, with headless CMS and powerful integrations.

Open Source Alternative to:

WordPress

GrowthBook

Open-source A/B testing and feature flagging platform

  • Stars

    8,566

  • Last commit

    10 hours ago

  • License

    MIT
Powerful, developer-friendly experimentation tool for data-driven product decisions. Seamless integration, real-time insights, and flexible deployment.

Open Source Alternative to:

LaunchDarkly

FireZone

Fast, flexible VPN replacement with zero-trust security

  • Stars

    9,168

  • Last commit

    5 hours ago

  • License

    Apache-2.0
Replace your VPN with zero-trust access built on WireGuard. Fast, scalable network security with simple policies and identity provider integration.

Open Source Alternative to:

Zerotier

Dograh

AI
Self-hostable voice agent platform with full model control

  • Stars

    Stars growing over the last 30 days6,028

  • Last commit

    19 hours ago

  • License

    BSD-2-Clause
Open-source voice agent platform that lets you plug in your own STT, LLM, and TTS models, deploy on-prem or in your VPC, and build agents via MCP or a visual workflow builder.

Open Source Alternative to:

Voiceflow

Hexclave

Modular auth, payments, emails, and analytics for your product

  • Stars

    6,887

  • Last commit

    18 hours ago

  • License

    Unknown
Self-hostable platform combining user auth, payments, email, and analytics into modular building blocks that fit around your existing product.

Open Source Alternative to:

Auth0

Plasmic

Visual app builder that integrates with your existing codebase

  • Stars

    7,148

  • Last commit

    6 hours ago

  • License

    MIT
Open-source visual editor for building websites and web apps. Connect to any data source, design custom UIs, and ship production React code without leaving your stack.

Open Source Alternative to:

Webflow

Fonoster

Open-source cloud communications platform for developers

  • Stars

    8,162

  • Last commit

    11 hours ago

  • License

    MIT
Build and deploy powerful voice and messaging applications with ease using Fonoster's flexible, scalable, and developer-friendly platform.

Open Source Alternative to:

Twilio

Rivet

Build stateful backends with in-memory actors

  • Stars

    Stars growing over the last 30 days6,582

  • Last commit

    7 hours ago

  • License

    Apache-2.0
Open-source infrastructure for long-lived, in-memory processes called Actors. Combines state and compute with sub-millisecond latency, realtime capabilities, and horizontal scaling.

Open Source Alternative to:

Cloudflare Workers

Mike

AI
Open-source legal AI that law firms control and extend

  • Stars

    4,421

  • Last commit

    7 hours ago

  • License

    AGPL-3.0
Self-hostable alternative to Harvey and Legora with document analysis, contract drafting, tabular review, and reusable workflows. Zero licensing costs, full data control.

Open Source Alternative to:

Harvey

Helicone

AI
Build reliable AI apps with comprehensive observability

  • Stars

    6,266

  • Last commit

    8 days ago

  • License

    Apache-2.0
Open-source platform for logging, monitoring, and debugging LLM applications. Route, debug, and analyze AI apps with comprehensive observability tools.

Open Source Alternative to:

DataDog

Your Next Store (YNS)

Launch Your Store in Minutes, No Code Needed

  • Stars

    5,538

  • Last commit

    24 hours ago

  • License

    MIT
Fast, modern e-commerce with instant setup and full customization. Powered by Stripe for seamless transactions.

Open Source Alternative to:

Shopify

Lingo.dev

AI
Automated translations that scale with your code and commits

  • Stars

    5,404

  • Last commit

    2 days ago

  • License

    Apache-2.0
Transform your app into a global product with AI-powered localization that integrates directly into your development workflow. Supports 83+ languages with Git-native automation.

Open Source Alternative to:

Crowdin

Lightdash

Open-source BI for modern data teams

  • Stars

    6,222

  • Last commit

    6 hours ago

  • License

    MIT
Self-serve analytics platform that transforms dbt models into interactive dashboards, enabling data-driven decisions across organizations.

Open Source Alternative to:

Power BI

Kan

Open source kanban boards with unlimited everything

  • Stars

    5,879

  • Last commit

    21 hours ago

  • License

    AGPL-3.0
Free kanban project management with unlimited boards, lists, and cards. Import Trello boards, collaborate with teams, and self-host for complete control.

Open Source Alternative to:

Jira

Plunk

The open-source, affordable email platform

  • Stars

    5,586

  • Last commit

    4 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

Flagsmith

Feature flags and remote config for rapid deployment

  • Stars

    6,640

  • Last commit

    13 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

    5,483

  • Last commit

    5 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

Inngest

Effortless event-driven workflows for modern applications

  • Stars

    6,021

  • Last commit

    6 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

    4,894

  • Last commit

    6 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

useSend

Pay per email sent, not for contact storage

  • Stars

    4,784

  • Last commit

    5 days 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

ACI.dev

AI
Build reliable AI agents with unified tool integration

  • Stars

    4,931

  • Last commit

    4 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

Pipeshub

AI
Enterprise workplace AI with data you own and control

  • Stars

    Stars growing over the last 30 days3,933

  • Last commit

    5 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

Rallly

Effortless group scheduling for seamless collaboration

  • Stars

    5,338

  • Last commit

    7 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

    5,127

  • Last commit

    1 day 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

Bknd

Feature-rich backend that runs anywhere you need it

  • Stars

    3,780

  • Last commit

    5 days ago

  • License

    Apache-2.0
Lightweight Firebase alternative with database, auth, storage, and workflows. Framework-agnostic backend that integrates with NextJS, Remix, Hono and more.

Open Source Alternative to:

Supabase

Tracecat

AI
Open source security automation platform for builders

  • Stars

    3,890

  • Last commit

    12 hours ago

  • License

    AGPL-3.0
Tracecat is a scalable, self-hostable platform for automating security workflows and playbooks without limits.

Open Source Alternative to:

Splunk

Erxes

Open-source growth platform for customer-centric teams

  • Stars

    4,111

  • Last commit

    5 hours ago

  • License

    AGPL-3.0
All-in-one solution for marketing, sales, and customer service. Boost engagement, streamline workflows, and drive growth.

Open Source Alternative to:

Salesforce

Laminar

AI
AI-powered platform for engineering LLM products

  • Stars

    Stars growing over the last 30 days3,473

  • Last commit

    11 hours ago

  • License

    Apache-2.0
Laminar is an open-source platform that helps collect, understand, and utilize data for building high-quality LLM applications.

Open Source Alternative to:

LangChain

Spliit

Effortlessly split expenses with friends and roommates

  • Stars

    3,043

  • Last commit

    14 days ago

  • License

    MIT
A user-friendly app for tracking shared expenses, settling debts, and managing group finances with ease and transparency.

Open Source Alternative to:

Splitwise

OpenLIT

AI
Monitor, debug, and scale LLM applications with ease

  • Stars

    Stars growing over the last 30 days2,906

  • Last commit

    2 days ago

  • License

    Apache-2.0
Open-source observability platform for GenAI and LLM applications. Real-time monitoring, distributed tracing, prompt management, and AI model evaluation built on OpenTelemetry.

Open Source Alternative to:

LangSmith

Autumn

Stripe payments, usage tracking, and paywalls in 3 functions

  • Stars

    2,832

  • Last commit

    14 days ago

  • License

    Apache-2.0
Simplify Stripe integration for AI startups with 3 functions, 0 webhooks. Build pricing plans in 30 minutes with usage tracking, credits, and feature controls.

Open Source Alternative to:

Stripe Billing

Dittofeed

Open-source customer engagement platform for automation

  • Stars

    3,044

  • Last commit

    24 days ago

  • License

    MIT
Dittofeed offers low-code tools for message automation across multiple channels, including powerful segmentation and personalization features.

Open Source Alternative to:

Mailchimp

Tianji

Website analytics, uptime monitoring, and server status in one

  • Stars

    3,118

  • Last commit

    21 hours ago

  • License

    Apache-2.0
Self-hostable platform combining website analytics, uptime monitoring, server status, Docker tracking, status pages, and telemetry for indie developers and small teams.

Open Source Alternative to:

Google Analytics

LearnHouse

Create, sell, and manage online courses with full control

  • Stars

    Stars growing over the last 30 days2,449

  • Last commit

    12 hours ago

  • License

    AGPL-3.0
Open-source LMS for building and selling courses with a block-based editor, built-in payments, AI tools, analytics, and white-labeling. Self-host or use the cloud.

Open Source Alternative to:

Udemy

Comp AI

Get audit-ready for SOC 2, ISO 27001, HIPAA, and GDPR

  • Stars

    Stars growing over the last 30 days2,078

  • Last commit

    22 hours ago

  • License

    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:

Vanta

WR.DO

Free DNS management and URL shortening platform

  • Stars

    2,291

  • Last commit

    7 days ago

  • License

    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:

TinyURL

Ray.so

Create beautiful images of your code

  • Stars

    2,371

  • Last commit

    4 days ago

  • License

    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.

c15t

Build privacy-compliant cookie banners with full control

  • Stars

    Stars growing over the last 30 days2,019

  • Last commit

    1 day ago

  • License

    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:

CookieYes

Grida

Open canvas for designing and building web apps

  • Stars

    2,698

  • Last commit

    17 days ago

  • License

    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:

Figma
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