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.
Flexible billing infrastructure for modern SaaS
Stars
1,333Last commit
7 days agoLicense
AGPL-3.0
Open-source pricing and billing platform that helps SaaS companies launch, test, and scale complex billing models with ease. Features metering, invoicing, and real-time data.
Open Source Alternative to:
One self-hosted binary replaces Vercel, Sentry, and analytics tools
Stars
846Last commit
6 hours agoLicense
Apache-2.0
Self-hosted platform for small dev teams combining deployments, error tracking, analytics, session replay, uptime monitoring, and managed databases in one dashboard.
Open Source Alternative to:
Build AI agents and automate complex workflows seamlessly
Stars
1,021Last commit
6 hours agoLicense
Apache-2.0
Create intelligent automation workflows combining AI agents with your favorite apps and services. Connect, automate, and scale your operations without complex coding.
Open Source Alternative to:
Persistent cloud VMs that hibernate and wake in seconds
Stars
566Last commit
9 hours agoLicense
Apache-2.0
Provides always-on virtual machines for AI agents with full OS access, persistent state, elastic CPU/memory resizing, and instant checkpoints.
Open Source Alternative to:
Visual regression testing for seamless UI development
Stars
640Last commit
6 hours agoLicense
MIT
Automate visual testing, catch UI bugs early, and collaborate effortlessly with your team to maintain pixel-perfect interfaces.
Open Source Alternative to:
Web3 writing platform for content creators and crypto enthusiasts
Stars
488Last commit
2 days agoLicense
MIT
Sigle is a secure, open-source platform for Web3 writers to create, publish, and monetize content on the Bitcoin blockchain.
Open Source Alternative to:
Self-hosted project management with boards and test tracking
Stars
345Last commit
16 hours agoLicense
AGPL-3.0
Self-hosted, open-source project management tool with boards, milestones, portals, time tracking, and test management on your own infrastructure.
Open Source Alternative to:
Unified API, event, and AI agent management platform
Stars
460Last commit
6 hours agoLicense
Apache-2.0
Full-lifecycle API management platform that unifies synchronous and asynchronous ecosystems. Manage APIs, event streams, and AI agents with enterprise security and 4x faster gateway performance.
Open Source Alternative to:
Open-source ideation tool for product feedback management
Stars
450Last commit
6 days agoLicense
Apache-2.0
ClearFlask is an open-source platform for collecting, analyzing, and acting on customer feedback to drive product development.
Open Source Alternative to:
Build lasting communities with modern forum technology
Stars
339Last commit
18 hours agoLicense
MPL-2.0
Create permanent, discoverable communities with modern forum features. Combines discussion, curation, and wiki functionality in one platform.
Open Source Alternative to:
Transform idle cash into competitive yield for startups
Stars
253Last commit
7 months agoLicense
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.
GDPR-compliant bot protection without user friction
Stars
197Last commit
7 hours agoLicense
Unknown
Privacy-first CAPTCHA service that blocks bots while keeping forms accessible. No puzzles, no tracking, no cookies - just invisible cryptographic protection.
Open Source Alternative to:
Transform documentation with developer-focused simplicity
Stars
114Last commit
4 days agoLicense
MIT
Create powerful, interactive documentation with hot reloading, TypeScript support, custom components, and built-in API docs generation.
Open Source Alternative to:
Privacy-friendly web analytics for data-driven decisions
Stars
134Last commit
8 months agoLicense
AGPL-3.0
Prisme offers customizable, GDPR-compliant web analytics with real-time insights, unlimited data retention, and bot filtering.
Open Source Alternative to:
LLM observability: cost, latency, and traces in one place
Stars
13Last commit
4 days agoLicense
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:
Ask once, get answers across every document
Stars
13Last commit
4 months agoLicense
AGPL-3.0
Upload files, ask questions, and get AI‑backed answers with citations. Compare, synthesize, and export results for teams and polished outputs.
Open Source Alternative to:
InfluxDB – The purpose-built time series platform for high-velocity ingestion and real-time queries at scale.
Bright Data
Docmost