Open Source Projects using OpenAPI
A curated collection of the 142 best open source software using OpenAPI. Find the most popular and trending open source projects to learn from, contribute to, or use in your own projects.
Open-source vector database for AI search and retrieval
Stars
29,510Last commit
21 hours agoLicense
Apache-2.0
Open-source vector database designed for AI applications. Store, search, and retrieve embeddings with semantic similarity matching and metadata filtering.
Open Source Alternative to:
Automate workflows with no-code integration platform
Stars
25,068Last commit
7 hours agoLicense
MIT
Open-source integration platform for seamless workflow automation. Connect apps, automate tasks, and boost productivity effortlessly.
Open Source Alternative to:
Zero Trust networking with WireGuard-based secure connectivity
Stars
30,005Last commit
13 hours agoLicense
Unknown
Open source platform combining WireGuard overlay networks with Zero Trust access controls. Features SSO, MFA, device posture checks, and granular policies for secure remote connectivity.
Open Source Alternative to:
Affiliate marketing platform built for SaaS companies
Stars
24,899Last commit
6 hours agoLicense
AGPL-3.0
Run affiliate, influencer, and referral programs with flexible reward structures, real-time attribution, and automated global payouts.
Open Source Alternative to:
Branded short links with analytics and conversion tracking
Stars
24,899Last commit
6 hours agoLicense
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:
Automate any website workflow with AI and computer vision
Stars
23,216Last commit
7 hours agoLicense
AGPL-3.0
Transform manual browser tasks into automated workflows using AI. Handle complex forms, CAPTCHAs, 2FA, and data extraction across any website at scale.
Open Source Alternative to:
Build powerful web apps without complex coding
Stars
28,334Last commit
23 hours agoLicense
Unknown
Low-code platform for creating custom business applications quickly. Design, automate, and deploy with ease.
Open Source Alternative to:
24/7 screen and audio recorder with AI memory search
Stars
21,955Last commit
11 hours agoLicense
Other
Records your screen and microphone locally, transcribes meetings automatically, and exposes selected work context to compatible AI assistants through its MCP server and local API.
Open Source Alternative to:
Take control of your identity with a secure, flexible solution
Stars
25,972Last commit
6 hours agoLicense
MIT
authentik is an open-source identity provider that offers self-hosted authentication, authorization, and user management for businesses of all sizes.
Open Source Alternative to:
Zero trust network access that's better than VPN
Stars
23,108Last commit
13 hours agoLicense
AGPL-3.0
Deploy zero trust access to infrastructure, self-hosted apps, and SaaS tools in days. Identity-aware security with seamless user experience.
Open Source Alternative to:
Flexible database meets intuitive spreadsheet interface
Stars
21,893Last commit
6 hours agoLicense
AGPL-3.0
Open-source platform combining powerful database capabilities with a user-friendly spreadsheet interface for efficient data management and collaboration.
Open Source Alternative to:
AI-powered DevSecOps for faster, secure software delivery
Stars
24,551Last commit
8 hours agoLicense
MIT
A comprehensive AI-powered DevSecOps platform that integrates development, security, and operations, streamlining software delivery and enhancing productivity.
Open Source Alternative to:
Python-native workflow orchestration for data and ML teams
Stars
24,024Last commit
18 hours agoLicense
Apache-2.0
Orchestrate data pipelines, ML jobs, and agent workflows in plain Python with automatic retries, scheduling, and a unified UI for every run across your infrastructure.
Open Source Alternative to:
Legally binding document signing for individuals and teams
Stars
18,736Last commit
4 days agoLicense
AGPL-3.0
Self-hostable e-signature platform for creating, sending, and signing PDF forms with automatic digital signatures, a REST API, and embeddable components.
Open Source Alternative to:
Open-source workflow automation for developers
Stars
18,200Last commit
6 hours agoLicense
Unknown
Powerful, self-hosted platform for building and running workflows, scripts, and apps with code-first approach and collaborative features.
Open Source Alternative to:
Scalable open-source distributed storage system
Stars
17,127Last commit
10 hours agoLicense
Unknown
Ceph provides unified object, block, and file storage from a single cluster built on commodity hardware.
Open Source Alternative to:
Run long-running AI tasks without timeouts or servers
Stars
16,551Last commit
15 hours agoLicense
Apache-2.0
Open source TypeScript platform for building and deploying AI agents and background workflows with retries, queues, observability, and elastic scaling.
Open Source Alternative to:
Open-source API documentation and testing platform
Stars
16,268Last commit
9 hours agoLicense
MIT
Scalar is an open-source tool for building, customizing, and hosting interactive API documentation with OpenAPI support.
Open Source Alternative to:
Classic, agile, or hybrid project management, self-hosted
Stars
16,437Last commit
6 hours agoLicense
GPL-3.0
Full-featured project management platform with Gantt charts, agile boards, time tracking, and team collaboration. Self-host or use managed cloud hosting.
Open Source Alternative to:
Privacy-first survey and experience management platform
Stars
13,112Last commit
6 hours agoLicense
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:
Secure cloud environments for enterprise AI agents
Stars
14,383Last commit
2 days agoLicense
Apache-2.0
Provide AI agents with secure, isolated sandboxes featuring real-world tools, code execution, and enterprise-grade security. Trusted by 88% of Fortune 100 companies.
Open Source Alternative to:
Common layer for composing and governing AI agents
Stars
10,838Last commit
6 hours agoLicense
Apache-2.0
Meta-harness that sits above Claude Code, Codex, and other AI agents to add policy enforcement, sandboxing, and real-time collaborative sessions.
Open Source Alternative to:
Secure, seamless authentication for modern applications
Stars
14,689Last commit
6 hours agoLicense
MPL-2.0
An open-source identity solution offering customizable login experiences, multi-tenant support, and comprehensive user management.
Open Source Alternative to:
AI-native vector database for intuitive applications
Stars
16,886Last commit
6 hours agoLicense
BSD-3-Clause
Open-source vector database designed for building powerful, production-ready AI applications with hybrid search capabilities and flexible deployment options.
Open Source Alternative to:
Secure and streamline database changes with CI/CD automation
Stars
14,573Last commit
7 hours agoLicense
MIT
Comprehensive platform for database schema migrations, security controls, and data masking with built-in review workflows and GitOps integration.
Build full-stack apps with TypeScript and real-time sync
Stars
12,703Last commit
16 hours agoLicense
Unknown
Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.
Open Source Alternative to:
Decentralized video platform for true digital freedom
Stars
15,367Last commit
1 day agoLicense
AGPL-3.0
Create your own video hosting platform with PeerTube - a free, open-source alternative to YouTube. Join 600,000+ videos across 1,000+ interconnected platforms without ads or tracking.
Open Source Alternative to:
Build beautiful documentation sites with Next.js
Stars
13,386Last commit
8 hours agoLicense
MIT
A flexible Next.js framework for creating stunning documentation sites with MDX support, built-in search, and customizable components.
Open Source Alternative to:
Open source messaging with privacy and community focus
Stars
10,598Last commit
13 hours agoLicense
AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
Open Source Alternative to:
Unify, automate, and elevate your monitoring workflow
Stars
12,412Last commit
18 days agoLicense
MIT
Open-source platform for centralizing alerts, automating responses, and enhancing incident management across your tech stack.
Open Source Alternative to:
Open-source LLM tracing & evaluation for AI optimization
Stars
11,870Last commit
11 hours agoLicense
Elastic-2.0
Open-source platform for LLM tracing, evaluation, and optimization. Features automatic instrumentation, prompt playground, and real-time AI application monitoring.
Open Source Alternative to:
Beautiful open-source monitoring for modern infrastructure
Stars
10,950Last commit
15 hours agoLicense
AGPL-3.0
Monitor servers, websites, Docker containers, and infrastructure with real-time insights, instant alerts, and powerful analytics. Self-hosted solution.
Open Source Alternative to:
The personal finance app for everyone
Stars
10,528Last commit
13 hours agoLicense
AGPL-3.0
An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.
Open Source Alternative to:
Private meeting notes, no bots, files you own
Stars
9,519Last commit
12 hours agoLicense
MIT
Records system audio without joining your call, then turns rough notes into editable summaries. Audio, transcripts, and notes stay as local files.
Open Source Alternative to:
A certified and battle-tested identity solution
Stars
13,923Last commit
3 months agoLicense
Apache-2.0
Ory is a certified and battle-tested identity solution backed by a large open source community and trusted by Fortune 500 companies.
Open Source Alternative to:
Feature flags for rapid, risk-free software deployment
Stars
13,881Last commit
6 hours agoLicense
AGPL-3.0
A powerful feature management platform enabling gradual rollouts, A/B testing, and seamless integration for continuous delivery.
Open Source Alternative to:
Ultra-fast AI gateway with enterprise-grade reliability
Stars
8,847Last commit
6 hours agoLicense
Apache-2.0
Open-source AI gateway delivering 50x faster performance than alternatives. Access 1000+ models from 8+ providers with built-in governance, fallback, and observability.
Open Source Alternative to:
Modern payment infrastructure for digital products and SaaS
Stars
10,364Last commit
6 hours agoLicense
Apache-2.0
Comprehensive payment solution with built-in tax handling, automated benefits, and seamless integrations for digital product and SaaS businesses.
Open Source Alternative to:
Effortless time tracking for open source projects
Stars
9,008Last commit
2 days agoLicense
AGPL-3.0
Seamlessly track time across multiple projects, generate insightful reports, and optimize your open source contributions.
Open Source Alternative to:
Distributed task queue for background jobs and workflows
Stars
8,126Last commit
15 hours agoLicense
MIT
Durable orchestration platform for managing AI agents, scheduling background tasks, and running mission-critical workflows.
Open Source Alternative to:
Open-source A/B testing and feature flagging platform
Stars
8,504Last commit
10 hours agoLicense
MIT
Powerful, developer-friendly experimentation tool for data-driven product decisions. Seamless integration, real-time insights, and flexible deployment.
Open Source Alternative to:
Self-hostable voice agent platform with full model control
Stars
5,884Last commit
1 day agoLicense
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:
c15t – Open-source cookie banner, built for control and lightening fast modern web apps.
c15t
Windshift
Sent