106 best open-source tools

Free open-source C# game engine for 2D and 3D games

Position #2 of 74 in Games · 12 alternatives · Facts on record: 3 of 5 · live ✓ · platforms · source

Privacy-friendly, open-source Google Analytics alternative

Position #2 of 77 in SaaS · 5 alternatives · Facts on record: 4 of 5 · live ✓ · platforms · pricing page · docs

Open source live video mixer

Position #2 of 77 in AI Audio & Video · Facts on record: 1 of 5 · live ✓

Python-powered open-source game engine with concise code

Position #4 of 74 in Games · 12 alternatives · Facts on record: 2 of 5 · live ✓ · source

Web framework for content-driven sites that ship zero JS by default

Position #4 of 77 in Dev Tools · 1 alternative · Facts on record: 3 of 5 · live ✓ · docs · source

Privacy-first Google Analytics alternative, open source and cookieless

Position #4 of 64 in Marketing · 7 alternatives · Facts on record: 2 of 5 · live ✓ · docs

Open-source password manager trusted by individuals and enterprises

Position #7 of 72 in Other · 4 alternatives · Facts on record: 2 of 5 · live ✓ · platforms

Learn web development together for free

Position #10 of 78 in Education · 5 alternatives · Facts on record: 2 of 5 · live ✓ · platforms

Fast all-in-one JavaScript runtime, bundler and package manager

Position #7 of 77 in Dev Tools · 1 alternative · Facts on record: 4 of 5 · live ✓ · platforms · docs · source

The free media player that plays everything, everywhere

Position #11 of 72 in Other · 3 alternatives · Facts on record: 0 of 5

Open-source platform for modern publishing and newsletters

Position #9 of 77 in SaaS · Facts on record: 4 of 5 · live ✓ · pricing page · docs · source

Simple open-source tool for making unique game sound effects

Position #9 of 74 in Games · Facts on record: 1 of 5 · live ✓

Free online sprite editor for pixel art and animations

Position #10 of 74 in Games · 4 alternatives · Facts on record: 2 of 5 · live ✓ · source

Transfer files cross-platform, no setup, no signup

Position #8 of 77 in Productivity · 12 alternatives · Facts on record: 3 of 5 · live ✓ · platforms · source

Community-driven developer roadmaps and guides

Position #15 of 78 in Education · Facts on record: 1 of 5 · live ✓

Next-generation frontend build tool with instant dev server

Position #10 of 77 in Dev Tools · 1 alternative · Facts on record: 2 of 5 · live ✓ · source

Offline-first open-source API client, a Postman alternative

Position #11 of 77 in Dev Tools · 1 alternative · Facts on record: 3 of 5 · live ✓ · platforms · docs

Pioneering open-source framework for autonomous AI agents

Position #11 of 77 in AI Agents · 7 alternatives · Facts on record: 4 of 5 · live ✓ · pricing page · docs · source

Open-source scheduling infrastructure, the Calendly alternative

Position #11 of 77 in Productivity · 2 alternatives · Facts on record: 1 of 5 · live ✓

Open-source note-taking with sync and encryption

Position #18 of 77 in Productivity · 12 alternatives · Facts on record: 4 of 5 · live ✓ · platforms · pricing page · source

Learn design through playful games and tools

Position #26 of 78 in Education · 8 alternatives · Facts on record: 1 of 5 · live ✓

Open web-based 3D engine for games and interactive experiences

Position #19 of 74 in Games · 12 alternatives · Facts on record: 2 of 5 · live ✓ · source

Open-source sandboxed cloud runtimes for AI agent code

Position #19 of 77 in AI Agents · Facts on record: 4 of 5 · live ✓ · pricing page · docs · source

Advanced AI Chatbot & Agent powered by GLM-5.2

Position #20 of 77 in AI Agents · 7 alternatives · Facts on record: 1 of 5 · live ✓