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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Privacy-focused note-taking made simple and fast
Stars
68Last commit
8 months agoLicense
GPL-2.0
Justnote is a secure note-taking app that lets you easily create and sync notes across devices while maintaining full control of your data.
Open Source Alternative to:
Secure, encrypted forms with advanced features
Stars
46Last commit
2 months agoLicense
AGPL-3.0
Build end-to-end encrypted forms with enterprise-grade features, no coding required. Protect sensitive data and enhance user trust.
Open Source Alternative to:
Self-hosted sticky notes with better organization
Stars
33Last commit
24 days agoLicense
MIT
A self-hosted, open-source note-taking app that keeps the Google Keep sticky-note feel while adding folders, timelines, list views, and import support.
Open Source Alternative to:
Monitors websites and APIs, pages on-call, and publishes a status page
Stars
34Last commit
1 day agoLicense
AGPL-3.0
Hosted uptime monitoring with multi-region checks, eight monitor types, on-call rotations, escalation policies, and public status pages for SaaS teams and agencies.
Open Source Alternative to:
Event ticketing with no per-ticket platform fees
Stars
32Last commit
6 hours agoLicense
AGPL-3.0
Sell tickets for £50/year with payments, QR check-in, refunds, reporting, and a hosted booking site. Self-hostable under AGPL-3.0.
Open Source Alternative to:
Privacy-first newsletter platform without tracking
Stars
32Last commit
12 hours agoLicense
AGPL-3.0
Create and send newsletters with complete privacy protection. No tracking, no data collection - just simple, clean email delivery with customizable templates and archive sites.
Open Source Alternative to:
Bridge internal workflows with public collaboration
Stars
27Last commit
7 days agoLicense
Unknown
Source-available project management platform with dual views - internal team workspace and public portal for user feedback, voting, and progress tracking.
Open Source Alternative to:
AI-powered task management with radical focus
Stars
25Last commit
7 months agoLicense
AGPL-3.0
Open source minimalist task management tool with AI companion that filters noise, automates coordination, and guides teams through complexity with calm focus.
Open Source Alternative to:
Blogging platform with built-in SEO, themes, and APIs
Stars
18Last commit
18 hours agoLicense
AGPL-3.0
Self-hostable blogging platform with a clean editor, zero-config SEO, custom themes, real-time collaboration, and built-in comments and newsletters.
Open Source Alternative to:
No-code platform to build AI agents and automate support
Stars
16Last commit
11 hours agoLicense
MIT
Build AI chatbots, automate customer support workflows, and connect live agents across web, WhatsApp, email, and voice with a no-code visual designer.
Open Source Alternative to:
LLM observability: cost, latency, and traces in one place
Stars
13Last commit
10 hours 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:
Complete website health monitoring and security scanning
Stars
15Last commit
4 months agoLicense
Unknown
Monitor website uptime, detect security vulnerabilities, find broken links, and simulate user flows. Get instant alerts when issues arise. Free tier available.
Open Source Alternative to:
Automatically discover hidden subscriptions from your inbox
Stars
11Last commit
12 hours agoLicense
AGPL-3.0
Free subscription tracker that automatically scans your email to find recurring charges. Privacy-focused discovery with complete spending overview and management tools.
Open Source Alternative to:
Ask once, get answers across every document
Stars
13Last commit
3 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:
Trace, evaluate, and protect every LLM call in one SDK
Stars
10Last commit
1 month agoLicense
AGPL-3.0
An AI gateway that sits on the request path to handle PII redaction, prompt injection blocking, tracing, evals, and cost tracking for OpenAI, Anthropic, and Gemini.
Open Source Alternative to:
Secure AI API management for iOS apps with DeviceCheck
Stars
8Last commit
9 months agoLicense
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
Own your hiring data with unlimited seats forever
Stars
0Last commit
1 month agoLicense
AGPL-3.0
Self-hosted open-source ATS with no per-seat pricing. Full data ownership, modern tech stack, and complete control over your recruitment process.
Open Source Alternative to:
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