Pencil Project
Free open source tool for GUI mockups and prototypes
1048 tools in our directory are listed as open source, from 30 sections: Frameworks (89), Open Source (82), UI & Components (80), Dev Utilities (55) and 26 more sections.

Free open source tool for GUI mockups and prototypes



Open source administration and query tool for PostgreSQL

Reliable backup and restore tool for PostgreSQL databases

Lightweight connection pooler for PostgreSQL databases

Full Postgres database that runs in the browser via WebAssembly

Open-source vector search extension for PostgreSQL

Web framework for Elixir apps, APIs and real-time pages

Documentation generator for PHP projects built from DocBlock comments

Web tool for administering MySQL and MariaDB databases


Network-wide ad and tracker blocking for every device at home

Open source platform for product data, assets and experiences

Official state store for Vue.js with type-safe, modular stores

Mutation testing system for Java that checks test quality
Federated photo and video sharing with chronological feeds

Open source Kubernetes debugging and observability with eBPF

Fast 2D renderer for games and interactive graphics on the web

Open source project management with work items, docs and AI


Open-source visual builder for websites and apps that use your code

Java and Scala web framework with a stateless, async design



Open source JavaScript graphing library with over 40 chart types

Open source email platform for transactional and marketing email

Fast, disk-efficient npm-compatible package manager for JavaScript

Single-file open source backend with database, auth and storage

Daemonless container engine for running and building containers

Free open source app for running containers and Kubernetes locally


Identity-aware access proxy for private apps, SSH and Kubernetes

Gateway and control panel for routing and monitoring AI calls


Extensible GraphQL API built on top of PostgreSQL databases

Open source relational database known for reliability and features

Standalone server that turns a PostgreSQL database into a REST API

Open source social media scheduler with AI agent and API support

Framework that manages and runs multi-language git hooks


Python workflow orchestration for data pipelines, ML and agents


Opinionated code formatter for JavaScript, CSS, Markdown and more

Design-agnostic React UI component suite with theming

Design-agnostic Vue component suite with flexible theming

Framework for building and running GitHub Apps in JavaScript

Free open source PHP CMS with custom fields and a flexible API
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