Halloy is an open-source IRC client written in Rust for macOS, Windows, and Linux, focused on being simple and fast. It supports a range of IRCv3 capabilities and is distributed under the GPL-3.0 license. It is also available from Flathub and Snap Store.
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Hammerspoon is a tool for automation of macOS, acting as a bridge between the operating system and a Lua scripting engine. Extensions expose system functionality, letting Lua code interact with APIs for applications, windows, mouse pointers, filesystem objects, audio devices, batteries, screens, keyboard and mouse events, clipboards, location services and wifi. Out of the box it does nothing; users create a Lua script in ~/.hammerspoon/init.lua.
Harbor is a CLI and companion app that starts a pre-wired local LLM stack. Users pick services such as Ollama, llama.cpp, vLLM, Open WebUI, SearXNG, Speaches and ComfyUI, and Harbor handles Docker Compose orchestration, configuration and cross-service connectivity with a single harbor up command.
Harmoni is a mobile client for browsing news links, stories and discussions.
Haruna is an open source media player for KDE with configurable options. It can play online videos through youtube-dl, supports YouTube playlists, and allows playlists to overlay the video when toggled by mouse-over. It also offers auto-skip for chapters containing certain words, configurable shortcuts and mouse buttons, and a quick jump to the next chapter by middle-clicking the progress bar.
The Harvard-MIT Program in Health Sciences and Technology is an educational initiative that trains the next generation of clinician-scientists and engineers. The program teaches participants to integrate science, engineering, and medicine, translate research findings into clinical practice, and improve human health.
HashMyFiles is a small utility that calculates MD5, SHA1, CRC32, SHA-256, SHA-512 and SHA-384 hashes of one or more files. The hash list can be copied to the clipboard or saved to text, HTML or XML files, and the utility can be launched from the Windows Explorer context menu to display hashes of a selected file or folder. It works on Windows 2000 through Windows 11.
Hayase is a bring-your-own-content torrent streaming client for anime. It streams the user's own torrents in real time and organizes, searches and tracks media the user supplies. It does not host, index or distribute content. Features include an advanced video player, offline viewing, subtitle support and watch-together functionality. It is available on multiple platforms.
HDClipartAll is a clip art library offering HD clipart images across categories such as animals, food, holidays and social media. The site states that images are available for free download for personal use, and it also provides an about and contact page.
HDRView is a research-oriented image viewer for examining and comparing high-dynamic-range images. It runs on macOS, Linux and Windows, with a slightly limited version in the browser, and offers live exposure, black-point and gamma tonemapping, false-color modes over 17 built-in colormaps, and clip warnings via zebra striping.
Dataset repository covering epidemiology and medical biometry/statistics, with searchable clinical trial data.
healthline reports or organizes updates on science, health, research and the environment.
Heavyweight generates professional-looking demand letters through document formatting. It is made by artist WTTDOTM and lawyer Kendra Albert, and is described as making letters that never actually claim legal authority. Templates include landlord repair requests, workplace examples, overdue client letters and security deposit requests.
A Twitch Helix API client written in Go.
Hexabot is a self-hostable AI workflow automation platform. It is used to build AI agents and workflows that interact across channels, using MCP tools, memory and data control. Projects can be started locally with the official CLI, and the platform is source-available under the FCL-1.0-ALv2 licence.
HeyGen is an AI video platform that creates videos with a Personal Avatar using the user's face and voice without filming each video. AI Studio offers a text-based editor for tone, delivery, gestures and emotion, and includes voice cloning and voice mirroring. It also offers the Seedance 2.0 video model from ByteDance for turning text or images into multi-shot clips.
HiCompress is an online image tools site offering over 20 free tools. It supports converting, compressing, editing and resizing images with simple clicks. Tools include JPG, PNG, WEBP, BMP and GIF compressors, crop tools, converters among formats and DPI converters, along with PDF tools such as compress, merge and split.
HidHide is an input device firewall that blocks individual applications from accessing HID and XInput devices, allowing controller inputs to be re-routed and re-mapped. It is inspired by HidGuardian but written from scratch, and ships with a client UI, a command-line interface and driver access for developers.
Search atmospheric, oceanography and climate data collections and supporting geospatial data from PRT.
Find and access atmospheric, oceanography and climate research data, with indexed datasets.
HKMDB — Click the button below to complete a quick verification (takes 5–15 seconds). Once done, you'll have full access.
An open source, mobile friendly web gallery that serves private media while keeping the existing file and folder structure, with AI powered image discovery. It is a pet project started in 2019, requiring CLI/terminal interactions; Linux/Debian is the most tested platform, and Mac or Windows runs are barely tested.
Honey (I Shrunk the AI) by GreenPT is a cross-tool coding skill that reduces AI coding-agent token usage and LLM API costs. It enables writing less code and prose and supports denser agent-to-agent handoffs, with reported 53% cost reduction and no quality loss in benchmarks. It is compatible with Claude Code, Cursor, GitHub Copilot, Codex, Gemini CLI, Windsurf, Cline, and Kiro.
HopToDesk is free and secure remote desktop software for Windows, Mac, Linux, Android, iOS, and Raspberry Pi, used for remote support, control, monitoring, screen share, file transfer, and live chat. It is free for personal and business use, with open source code and end-to-end encrypted traffic. A separate dashboard adds device management, ticketing, and white-label clients on paid plans.