Ice Cubes for Mastodon is a Mastodon client by Thomas Ricouard. It connects to any Mastodon instance and supports browsing home, federated and local timelines, push notifications, timeline sync, lists, tag groups, direct messages, profile editing, multi-account support and customization options. It is free with in-app purchases and is open source.
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Icon Shelf is a free and open source icon manager for web developers. It connects to a web project's assets folder and does not add extra files to it. Icons can be organized by collections, previewed, and searched, and copied as import statements for frameworks including React, Vue, Svelte and Ember. It runs on macOS, Windows and Linux.
Iconbuddy is an icon search and download service offering over 300,000 free SVG icons from open source libraries. Users can customize colors and sizes and export in SVG, PNG, JSX, or Base64 formats. The site also documents an MCP server for coding agents and lists extensions for Figma, VS Code, Framer, WordPress and Chrome.
iconmonstr is a source of simple icons run by one creator. The site states it offers 4784 free icons in 316 collections, available as SVG and PNG. Icons come in fill and outline versions, designed on a 24-pixel grid, with an icon generator for size, color and background shape.
Iconoir is an open source icon library distributed under the MIT license. The site states it offers 1,671 icons free for download without email sign-up. Icons are available in SVG, Font, React, React Native, Vue, Flutter, Figma and Framer. From the changelog, the project releases versions adding new icons, with support for SolidJS added in v7.12.0.
Bootstrap Icons is a free, open source icon library with over 2,078 icons. The icons can be included as SVGs, an SVG sprite, or web fonts, and used with or without Bootstrap in any project. It is also available as the bootstrap-icons npm package and can be opened in Figma.
IDEM is an interdisciplinary database of manuscripts and printed books relevant to the Alamire Foundation's research, focusing on the musical heritage of the Low Countries from the early Middle Ages until 1800. It contains digital images of manuscripts and prints digitized by the Alamire Digital Lab, complemented by interrelated sub-databases for studying sources from multiple perspectives.
The IDIA Science Gateway Public Data Archive provides a public data archive for IDIA support projects. It includes the first superMIGHTEE uGMRT data release with Stokes I mosaic images and source catalogues from observations of XMM-LSS, COSMOS and ECDFS, along with image and catalogue files for software testing and CARTA tutorials.
The IEM Plug-in Suite is a free and open-source audio plugin suite created by staff and students of the Institute of Electronic Music and Acoustics. It includes Ambisonic plug-ins up to 7th order, such as the RoomEncoder and StereoEncoder. Documentation covers topics including Ambisonics formats, configuration files and OSC control.
IGMDb is an online source for LGBTQ+ themed movie news and information. The site lists recent releases, festival showings, series and trailers, including items marked as on TV, online, in theaters or at festivals.
A collection of audio plugins and Kontakt instruments published by an Amsterdam-based creative technologist. Audio plugins are offered in VST and Audio Unit formats for macOS and Windows, and the plugins also work on Linux hosts when built from source. All plugins and instruments are free to use.
igraph is a collection of network analysis tools emphasizing efficiency, portability and ease of use. It is open source and free, and can be programmed in R, Python, Mathematica and C/C++. Implementations include the igraph R package, python-igraph, IGraph/M and the igraph C library.
An Information is Beautiful graphic reviewing meditation and mindfulness, including how it is practiced, its different types, and scientific research on effects on the body and brain. The page was compiled from many sources and over 75 scientific studies, with the evidence presented in one graphic and datasheet.
IINA is a free and open-source media player designed for macOS, with native features and plugin support. It is built on mpv and maintained by its community. It does not include tracking or telemetry. Plugins can add subtitle sources, video tools and new interfaces.
iloader is a free, open-source, cross-platform iOS sideloading companion for installing SideStore and other IPA apps. It is available for Windows, Mac and Linux, and can place RPPairing and Lockdown Pairing files into apps such as StikDebug or Protokolle.
Image Extractor helps download images, albums, wallpapers, or visual media from supported sources.
Image Mage is a client-side web tool for turning photos into styles such as comic book art, abstract paintings and pixel art. Processing happens in the browser, and the author states no access to uploaded images. It is free and open source, with no paywalls or premium options, and may be used for personal or commercial purposes.
Image Splitter is a small tool that splits images into square tiles, such as large Discord emojis. It is open source and provides a preview plus a download that includes a text file for displaying the emojis after upload.
ImageGlass is a free, open-source image viewer for more than 90 formats, including WEBP, GIF, SVG, HEIC and RAW. Version 10 is rebuilt on .NET and Avalonia as a single codebase for Windows, macOS and Linux. The viewer includes a color picker, EXIF metadata viewing, crop and resize tools, frame navigation and HDR tone mapping.
ImageJ is open source, public domain software for processing and analyzing scientific images. It is part of an ecosystem including ImageJ2, Fiji and other related variants, with support for hundreds of extensible plugins for scientific imaging tasks. The project maintains a community-edited wiki with documentation for users, developers and contributors across supported platforms.
ImageMagick is a free, open-source software suite for creating, editing, converting and manipulating images. It supports over 200 format variants, including JPEG, PNG, GIF, TIFF, WebP and AVIF. The command-line tools run single-file conversions or multi-step processing pipelines. Bindings exist for C, C++, Python, .NET and Node.js.
ImageOptim is a free, open-source Mac app that compresses images without losing quality, reducing file sizes for faster loading and less disk space use. It removes private EXIF metadata, comments, thumbnails and unnecessary color profiles. It combines tools including MozJPEG, pngquant, Pngcrush, 7zip, SVGO and Google Zopfli, and accepts drag-and-drop input. Lossy minification is an optional setting.
Imagepipe is an Android app that reduces image size and removes exif tags when images are shared. It changes resolution and quality, saves the modified image in a separate folder as jpeg, png or webp, and leaves the original unchanged. Editing tools include paint, blur, crop, rotate and text.
A worldwide directory of IMAX theatres that lists screen sizes, projector types and technical specifications. It offers an interactive database with sorting, filtering and search, plus guides to IMAX projector types and articles on IMAX technology, history and installations. The site is described as open source and community driven, with sections for exploring theatres by region.