Pieces is a memory layer that runs in the background on a computer, forming a searchable record of work from apps the user already uses. It captures activity chronologically so users can search, filter and revisit moments, and carry context into AI tools. Memories are saved on-device by default, and capture from copy and paste is opt-in.
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Plandex is an open source AI coding agent built for large projects and real-world tasks. It includes smart context management for large codebases, configurable autonomy levels, and tools to support producing production-ready results.
Planet GNU is an aggregation of development blogs from the GNU Project. It publishes updates about GNU software releases, including announcements for projects such as parted, automake, gzip, and pspp.
Flappy is an SDK for building applications and agents that use large language models, organized as a monorepo with libraries in several programming languages. The repository was archived by its owner on Jun 13, 2024, and the project was described at the time as still under development.
Pleroma is social networking software compatible with other Fediverse software such as Misskey, Pixelfed and Mastodon. It is free software, with development and issue tracking on the project's GitLab instance. Users can join an existing instance or follow an installation guide to set up their own server. Multiple frontends are available, including Pleroma FE, Soapbox and Glitch-lily.
PocketBase is an open-source backend tool distributed as a single file. It includes a realtime database, user authentication, file storage, and an admin dashboard. It can be used as a standalone application or extended via Go and JavaScript hooks, and integrates with common frontend development stacks.
Poirot is a native macOS companion app for Claude Code. Built with SwiftUI, it lets users browse sessions, explore diffs, and re-run commands. It also provides session analytics, usage limit gauges, conversation views, and search across sessions. The app requires no login and no analytics and works offline.
Ponytail 5 is a ruleset for AI coding agents intended to make them write the least code that works. It provides a review command and an audit command, and states tests accompany risky logic. The project reports benchmark comparisons against running without it.
Popular Computer Weekly covers technology, digital products, computing and industry developments in People's Republic of China.
Popular Science covers science, health, research or environmental developments.
The Earth Magic Portal Generator is a web application that enables users to navigate between videos of global locations. It offers two control modes: hand tracking, which is recommended, uses the device camera to track hand movements with all data processed locally in the browser, and mouse control. Users open a portal by moving their hand or mouse over a central circle, change videos via clockwise circular motion, enter fullscreen by holding the gesture or clicking the portal, and access previous videos with counterclockwise motion. The app includes settings for control mode, hand and camera previews, and accepts donations to support development.
Pose Search is a project hosted on GitHub under the repository x6ud/pose-search, associated with the demo site x6ud.github.io/pose-search. The repository includes project setup, development, and production build and minification functionality, with documentation for adding data to the project.
The Post-Reformation Digital Library is a select database of digital books relating to the development of theology and philosophy during the Reformation and Post-Reformation/Early Modern Era, including late medieval and patristic works printed and referenced in that era. It is a project of the Junius Institute for Digital Reformation Research and offers browsing by authors, places, publishers, dates, genres and topics.
The Powder Toy is a free open-source desktop falling sand physics sandbox game. It simulates air pressure, velocity, heat, gravity, and interactions between various substances, providing building materials, liquids, gases, and electronic components for users to construct machines, terrains, or other creations. Users can browse and upload community saves, and the game includes a Lua API for automation and plugin development. Its source code is distributed under the GNU General Public License.
Prediction Guard is a self-hosted AI control plane described as enforcing NIST and OWASP-aligned runtime controls inside an organization's security boundary. It offers Agent Forge for creating interactive and autonomous agents, and an OpenAI, Anthropic and MCP compatible API. The site lists a Docker Verified Publisher agentic program entry and a verified Agent Control Kit on Docker Hub.
Pretend You're Xyzzy is a web version of a Cards Against Humanity clone. The page states the webapp is still in development and that bugs may occur. It notes gameplay results are logged permanently without identifying information, and that all chat and fill-in-the-blank cards were disabled in a 2018 update.
Prettier Lichess is a Chrome and Firefox extension that restyles lichess.org and lets users customize the site's complete color palette, with import and export of palettes. The extension is under constant development, and some page elements may not be styled correctly.
Prirodoslovlje covers science, health, research or environmental developments.
Build tool for data science pipelines.
PromethAI is an open-source backend framework that provides AI agents to assist users with decision-making, setting personalized goals, and executing those goals. The project's development work has been transitioned to a new product named cognee.
Promptfoo is an AI security testing platform that integrates into development workflows. It connects to AI apps, agents and CI/CD pipelines, generates context-aware attacks, and provides remediation guidance in pull requests. It offers red teaming, an open-source edition and integrations including GitHub Actions, GitLab CI, Jenkins and MCP.
Proteus covers science, health, research or environmental developments.
ProWritingAid's grammar checker fixes grammar and style issues and integrates with writing apps such as Word, Google Docs, and Scrivener. The page also lists a paraphrasing tool, inspiration generator, writing analyzer, and developmental editor, and offers free sign-up and viewable plans.
PsychArchives is a disciplinary repository for psychological science and neighboring disciplines. It accommodates 20 digital research object types, including articles, preprints, research data, code, supplements, preregistrations, tests and multimedia objects, and assigns DOIs to archived content.