Free
Apache ECharts
Open SourceData Viz & Charts · Frontend
Enterprise-grade charting from Apache: huge chart catalog, big-data rendering and rich interactions.
chartsdata-vizbig-datajavascript
Browse the complete directory — use filters to narrow down.
Data Viz & Charts · Frontend
Enterprise-grade charting from Apache: huge chart catalog, big-data rendering and rich interactions.
Web Servers & Proxies · DevOps
The classic, widely-used Apache web server.
Load & Performance · Testing
Classic Java-based load and performance testing tool.
Queues & Streaming · Database
The industry-standard distributed event streaming platform.
Dashboards & BI · Data & Analytics
Powerful open-source data exploration and visualization platform.
API Clients · API Tools
All-in-one API platform for design, debug, mock, test and document.
ORMs · Backend
GraphQL platform: server, client caching and federation.
Design & Prototyping
Web-based designer for iOS store listing images that handles all the screenshots together as a single panorama, letting mockups and copy flow across slide boundaries before you download correctly sized PNGs for iPhone and iPad. Free to start; paying $9 once for Pro unlocks saving to disk, iPad device frames, pattern export and an MCP server for coding agents.
Mobile Backend & Services · Mobile Development
Self-hostable backend platform: auth, databases, storage and functions.
Development Platforms · IoT & Embedded
The official Arduino IDE 2.x — autocomplete, debugging and board manager for the world's most popular maker boards.
CI/CD · DevOps
Declarative GitOps continuous delivery for Kubernetes.
UI Libraries · Frontend
Headless component library for React, Vue and Solid, powered by Zag.js state machines.
Load & Performance · Testing
Modern load testing and smoke testing for APIs and microservices.
Screenshots · Image & Media
Record terminal sessions as lightweight, copy-pasteable text casts — embeddable and shareable.
Frameworks · Backend
Microsoft's cross-platform framework for web apps and APIs.
Frameworks · Frontend
Web framework for content-driven sites that ships zero JS by default.
Documentation Generators · PDF & Documents
Astro's documentation framework — fast, accessible docs sites with search, i18n and sidebar tooling built in.
Design Systems · Design & Prototyping
Atlassian's design system with components and content guidelines.
Terminals & Shells · Development Environment
Synced, searchable shell history with fuzzy matching and analytics.
Audio & Video · Image & Media
The classic open-source audio editor — multi-track editing, noise removal and effects for podcasts and voiceovers.
Authentication · API Tools
Open-source authentication for Next.js and other JS frameworks.
Authentication · API Tools
Okta's identity platform for authentication and authorization.
Animation · Frontend
One-function animation utility that adds smooth transitions to DOM changes — zero configuration.
Agent & LLM Frameworks · AI for Developers
Microsoft's framework for multi-agent AI conversations.