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Open Source Projects using Vercel Functions

A curated collection of the 30 best open source software using Vercel Functions. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.

Supabase

Postgres-powered backend platform for production apps

  • Stars

    Stars growing over the last 30 days114,547

  • Last commit

    5 hours ago

  • License

    Apache-2.0
Provides a full backend stack built on Postgres: authentication, auto-generated APIs, edge functions, realtime subscriptions, file storage, and vector search.

Open Source Alternative to:

Firebase

LobeChat

AI
Manage, build, and run AI agent teams around the clock

  • Stars

    83,962

  • Last commit

    5 hours ago

  • License

    Unknown
A collaborative platform to create, schedule, and operate AI agents that handle long-running tasks, team workflows, and automated jobs without constant oversight.

Open Source Alternative to:

Claude

Cal.com

Self-host your own scheduling page, no vendor required

  • Stars

    49,700

  • Last commit

    2 days ago

  • License

    MIT
Cal.diy is the community edition of Cal.com for personal self-hosting, with calendar sync, video conferencing, payment support, and a REST API.

Open Source Alternative to:

Calendly

Tabby

AI
AI-powered code completion for seamless development

  • Stars

    33,918

  • Last commit

    4 months ago

  • License

    Apache-2.0
Self-hosted AI coding assistant that enhances productivity with context-aware suggestions and privacy-focused implementation.

Open Source Alternative to:

Codex

Dub Links

Branded short links with analytics and conversion tracking

  • Stars

    25,107

  • Last commit

    9 days ago

  • License

    AGPL-3.0
Link management platform for marketing teams with custom domains, UTM builder, A/B testing, geo-targeting, QR codes, and real-time conversion analytics.

Open Source Alternative to:

TinyURL

Formbricks

Privacy-first survey and experience management platform

  • Stars

    13,217

  • Last commit

    5 hours ago

  • License

    AGPL-3.0
Collect feedback across websites, apps, and emails with targeted surveys, user segmentation, and GDPR-compliant data handling. Self-host or use the cloud.

Open Source Alternative to:

Google Forms

Midday

Streamline your business finances and operations

  • Stars

    15,114

  • Last commit

    5 months ago

  • License

    AGPL-3.0
All-in-one tool for freelancers and small businesses to manage finances, track time, store files, and send invoices efficiently.

Open Source Alternative to:

YNAB

Scira

AI
Minimalistic AI-powered search engine for instant answers

  • Stars

    11,912

  • Last commit

    3 months ago

  • License

    AGPL-3.0
Scira delivers concise, AI-generated responses to queries using a clean interface and powerful search capabilities.

Open Source Alternative to:

Perplexity

Instant

Realtime client-side database for collaborative apps

  • Stars

    10,562

  • Last commit

    7 hours ago

  • License

    Apache-2.0
Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.

Open Source Alternative to:

Supabase

Papermark

Open-source document sharing with powerful analytics

  • Stars

    9,291

  • Last commit

    2 months ago

  • License

    AGPL-3.0
Secure, customizable platform for sharing documents and tracking engagement. Perfect for sales teams, marketers, and businesses.

Open Source Alternative to:

PandaDoc

KeystoneJS

Flexible, scalable Node.js CMS and app framework

  • Stars

    9,987

  • Last commit

    2 days ago

  • License

    MIT
A powerful, customizable content management system and application framework built on Node.js, GraphQL, and React

Open Source Alternative to:

WordPress

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

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

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

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

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.

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

MailCheap

Open-source newsletter app billed by emails sent

  • Stars

    Stars growing quickly over the last 30 days1,629

  • Last commit

    23 hours ago

  • License

    AGPL-3.0
Newsletter platform billed by emails sent, not list size, with scheduling, a public website, AI agent access and deliverability tools from $19 a month.

Open Source Alternative to:

Mailchimp

Languine

Automated localization for modern development teams

  • Stars

    2,032

  • Last commit

    6 months ago

  • License

    MIT
A developer-focused localization platform that automates translation workflows within your existing development pipeline and CI/CD processes.

Open Source Alternative to:

Crowdin

Linky

A delightfully rich and dynamic link-in-bio.

  • Stars

    799

  • Last commit

    16 days ago

  • License

    MIT
Build a dynamic link-in-bio page with a drag-and-drop editor. Integrate platforms to showcase live content and connect with your audience.

Open Source Alternative to:

LinkTree

Contentport

Your content engine for growing on Twitter at scale

  • Stars

    772

  • Last commit

    11 months ago

  • License

    AGPL-3.0
Create, schedule & manage Twitter content at scale with AI assistance, beautiful visuals, and multi-account support. Perfect for busy founders.

Open Source Alternative to:

Post Bridge

Notra

AI
Track your brand's visibility across AI answer engines

  • Stars

    Stars growing over the last 30 days270

  • Last commit

    21 days ago

  • License

    AGPL-3.0
GEO tool that queries ChatGPT, Claude, Gemini, and Perplexity with your buyers' questions, then shows you who gets recommended and how to close the gap.

Open Source Alternative to:

Otterly.AI

Changes.Page

Effortless changelog creation for open-source projects

  • Stars

    284

  • Last commit

    3 months ago

  • License

    AGPL-3.0
Automate and simplify changelog generation from Git commits, ensuring clear and consistent project documentation.

Open Source Alternative to:

Canny

0 Finance

AI
Transform idle cash into competitive yield for startups

  • Stars

    256

  • Last commit

    7 months ago

  • License

    MIT
High-yield treasury management for startups earning 8% APY with insurance coverage up to $1M. Open US/EU accounts instantly with full liquidity and no minimums.

Zenblog

Effortless blogging for developers and tech enthusiasts

  • Stars

    254

  • Last commit

    2 months ago

  • License

    AGPL-3.0
A minimalist, markdown-based blogging platform designed for developers, featuring syntax highlighting and seamless Git integration.

Open Source Alternative to:

WordPress

Comma

Launch your personal website in minutes, no coding required

  • Stars

    226

  • Last commit

    6 months ago

  • License

    AGPL-3.0
Free site builder to create a personal website with articles, projects, email capture, and analytics. Open source, fast, and beautifully designed.

Open Source Alternative to:

WordPress

Slugy

Transform long URLs into beautiful, trackable short links

  • Stars

    95

  • Last commit

    24 days ago

  • License

    MIT
Open-source URL shortener with analytics, custom domains, QR codes, and link-in-bio pages. Create branded short links with detailed tracking insights.

Open Source Alternative to:

TinyURL

Spanlens

AI
LLM observability: cost, latency, and traces in one place

  • Stars

    13

  • Last commit

    3 days ago

  • License

    MIT
Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.

Open Source Alternative to:

LangSmith

Proxed AI

AI
Secure AI API management for iOS apps with DeviceCheck

  • Stars

    9

  • Last commit

    26 days ago

  • License

    AGPL-3.0
A secure proxy service that protects AI API keys using Apple DeviceCheck, enabling safe integration of ChatGPT, Claude, and other AI models in iOS apps
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