Harper is an open-source grammar and spell checker that runs entirely on the device. It covers US, UK, Canadian, Australian and Indian English, and performs checks locally without cloud round-trips, telemetry or an LLM. Integrations listed include Obsidian, Chrome, Firefox, WordPress, Visual Studio Code, Neovim, Helix, Emacs, Zed and Sublime Text.
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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.
Pwned Passwords is a corpus of previously breached passwords made freely available so services can block them from being reused. It is free and open source, and offers API access or a downloadable dataset. Passwords are checked using k-anonymity so the full password or hash is not sent to the service.
Haven is open-source software for hosting a private blog and feed reader on one's own server. Posts can include pictures, and access is limited to accounts the owner creates. The site also lists a hosting service on a dedicated virtual server for $5 per month.
hckrnws collects or organizes headlines and links for browsing news from multiple sources.
Heads is an open source custom firmware and OS configuration for laptops and servers. It combines physical hardening of hardware platforms and flash security features with custom coreboot firmware and a Linux boot loader in ROM, measuring boot steps into the TPM. It is intended for cases where data and state are stored on the computer.
Helio is an open-source music sequencer for desktop and mobile platforms. Its documentation covers hotkeys, refactoring options and arpeggiators. The project aims to rethink the music sequencer with a minimalistic, distraction-free interface and an emphasis on clear design over cleverness, encouraging experimentation in areas such as exotic scales and microtonal temperaments.
HelixNotes is a local markdown note-taking app built with Tauri, SvelteKit, and Rust. Notes are stored as standard Markdown files on the local filesystem. The Codeberg repository is a historical backup; the project has moved to GitLab and is no longer updated there.
Helm is a free, cross-platform polyphonic synthesizer with a powerful modulation system by Matt Tytel. It runs on GNU/Linux, Mac and Windows as a standalone program or as an LV2, VST, VST3 or AU plugin. Helm is free software, with source code that can be studied, changed and redistributed.
Hermes Agent is an open-source, self-hosted AI agent by Nous Research. It is available as a terminal app and as Hermes Desktop for macOS, Windows and Linux, with persistent memory and a messaging gateway for platforms such as Telegram, Discord, Slack, WhatsApp, Signal and email. It is free under the MIT license.
Hermetics hosts an esoteric magical e-books library menu with links to texts in outside sources. The listed categories include ancient texts and myths, occult magic, alchemy, astrology, geomancy and divination, grimoires, Renaissance magic, Rosicrucian and Martinist works, Theosophy and Anthroposophy, Golden Dawn, and witchcraft and Wicca.
Heroic Games Launcher is a free and open source launcher for Epic Games, GOG and Amazon Prime Games. It runs on Linux, Windows, macOS and the Steam Deck, and is available as Flatpak, AppImage, Windows installer and macOS app. It includes a download queue, custom artwork, Wine and compatibility tool management, and a full-screen console mode.
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.
HiClipart is a collection of transparent background PNG cliparts intended for designers. The source states the cliparts are free, offer unlimited download, are easy to use, and require no registration.
A community dedicated to the preservation of video game development media such as prototypes, hardware, source code and artwork, started in 2006. The website serves as a catalog for items collected and shared. It has archived over 1000 development builds for various video game systems.
High Assurance Rust is a book about developing secure and robust software. It presents a project-based approach to systems programming and low-level software security, teaching Rust by re-implementing a major dynamic collection from its standard library. It discusses using open-source software assurance tools, including rustc, libFuzzer, rr, qemu, differential fuzzing and deductive verification.
High schools that received NRA grants 2010-2016 helps search public records, court data, genealogy sources, property information, or archived records.
Higher Intellect is a World Wide Web server hosting a searchable database of over 850,000 text files on a variety of subjects. It also runs a server on the Hotline and KDX protocols with a collection of antique software, obscure operating systems and open source software, and hosts multiple wikis, including a Vintage Computer Wiki.
An archived Bitly bundles page belonging to Hilary Mason, listing link collections on topics such as research-quality data sets, programming, data stories and data science blogs. The page notes that Bitly sunset bundles on May 7, 2015 and converted them to tags.
Hipo is an open-source liquid staking protocol on TON. Users stake GRAM and receive hGRAM, a liquid staking token representing staked GRAM that can be used across TON DeFi while rewards accrue. HPO is the governance and profit-sharing token. Hipo Club is a tiered programme rewarding active participants. The site states Hipo does not promise fixed returns and is not risk-free.
Hitch is a scalable, open source SSL/TLS proxy based on libev. It handles large numbers of connections on multicore machines, supports TLS 1.0, 1.1 and 1.2, and is the successor of the Stud project. It is licensed under a 2-clause BSD license and has been tested on Linux.
HizSearch is a high-performance search engine for games, verified repacks, and scene releases. It aggregates content from sources including FitGirl, DODI, SteamRip, and skidrow to let users find the latest game releases in one place.
Hmong Studies Citations is a web index of documents and information about Hmong people published from 1975 to 2018. It records titles, authors and publication years, drawing on sources including the Hmong Studies Journal, Web of Science, ProQuest Dissertations and Theses, other Hmong collections and Mark Pfeifer's materials.
HNRankings helps analyze websites, rankings, screenshots, traffic estimates, or public web statistics.