Calibre is e-book management software described as a one stop solution for e-book needs. It includes an e-book editor, format conversion guidance and a user manual, with introductory videos, an FAQ list and a Quick Start Guide added to the library on first run.
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CamStreamer hosts a live gallery of streams captured via its in-camera app, covering categories such as airports, animal enclosures, city locations, construction sites and Axis experience centers. It also offers services for users to start their own live broadcasts.
Canoeboot is a free/libre coreboot distribution providing BIOS/UEFI boot firmware for specific Intel/AMD x86 and ARM motherboards. It initialises hardware and starts a bootloader, offering GRUB, SeaBIOS and U-Boot payloads in a single image with a choice at boot time. Linux and BSD are supported. It removes binary blobs from coreboot, including CPU microcode updates.
Catalogue contains the holdings information of the German National Library starting from 1913.
Chronophoto is a browser game that tests knowledge of pop culture and history by asking players to guess the year a photograph was taken. It offers unlimited games, a daily challenge, and a party game for friends. Photo years span 1900 to 2025, and a custom range starts a new game.
Claid AI is an AI-powered product photography and fashion photo editing tool that converts simple input images into photoshoot-quality outputs, including realistic lifestyle scenes, on-model photos, and clean cutouts, with 4K resolution results. The service offers a free starting tier.
The CLARIN portal of the Dutch Language Institute (INT) is a CLARIN B Centre serving the Netherlands and Flanders. It provides researchers and students with data, tools and advice for linguistic research, hosts and archives materials so they can be found through the CLARIN infrastructure, and offers a quick start to resources including corpora and search tools such as AutoSearch.
climin is a Python package for optimization that is heavily biased toward machine learning scenarios, distributed under the BSD 3-clause license. It works on top of numpy and partially gnumpy, and was started in winter 2011 by Christian Osendorfer and Justin Bayer.
CodeSandbox is a cloud development platform that enables developers to code, collaborate and ship projects of any size from any device. Following its merger with Together AI, it offers the CodeSandbox SDK for programmatically creating isolated sandboxes for instant code execution in AI agents and code playgrounds. The platform provides secure, scalable environments with features such as quick start, auto-resume and customizable hibernation.
Codrops is a web design and development blog founded in 2009. It publishes articles, tutorials, and demos on frontend techniques, interactive experiences, and creative web design, and maintains a showcase of hand-picked website demos.
Comicory is an AI comic generator for comic strips, manga, and comic books. Users write a story, choose a style, and keep character art consistent across panels. It supports script panels, character references, layouts, frame redraws, and multi-page PDF, PNG, and ZIP exports. A one-time grant of 10 starter credits is offered on signup without a card.
A physics-based simulation of two independently driven pendulums that begin with nearly identical conditions. Users can adjust parameters and drag a pendulum to change its starting position; over time the two pendulums diverge, illustrating sensitivity to initial conditions in chaotic systems.
A Movember web tool offering practice conversations on topics such as loneliness, relationships, grief and unemployment. It guides users through starting a conversation and keeping it moving in a non-judgemental direction, and links to the ALEC skills: Ask, Listen, Encourage Action, Check In.
Convos is an open-source multiuser chat application hosted in the convos-chat/convos GitHub repository. It is designed as a simple option for using IRC directly in a web browser. The repository includes documentation for quick start, local installation, Docker deployment, and release creation.
CoreWeave is an AI cloud platform with integrated technology and teams built for complex AI workloads. It offers Forge, described as tools for running and improving AI systems with any cloud, model or framework, and infrastructure for demanding workloads. Direct-to-Expert provides AI engineering support from CoreWeave engineers in existing channels. Forge pricing lists Free, Pro starting at $60 per month billed monthly, and Enterprise custom plans.
Cosmos generates 30-second video essays from a typed idea, with sourced facts, archive pictures, a voiceover and original music. Films can be made free up to three a day, with a watermark, and a clean 1080p MP4 can be bought for $9. No credit card is required to start and there is no subscription.
Couleur.io is a simple color tool for finding harmonizing color palettes for web projects. It generates palettes from a selected starter hue and saturation level, produces modern CSS, and offers accent color ideas. A 10-swatch palette is created using varying lightness levels.
COUNT is accounting software that provides automated finance features including AI transaction categorization, bill tracking, invoicing, and real-time reports. It offers plans named Starter, Growth and Pro, each with a free 30-day trial.
A free browser-based tool for cropping video files, using HTML5 and JavaScript so files are processed locally without upload. Users set the cropping area with the mouse or by entering values and can set start and end times. Output format can be configured, and supported formats include MP4, WEBM, MOV, FLV, MKV and AVI.
Crosserville is a web app for constructing crosswords. It offers custom grid building, customizable fill search, word list management with a curated 174K word list, clue writing tools, and export to .puz, ipuz, PDF, or NYT submission format. Users create an account to get started.
Csdocs is the getting started documentation for CloudStream 3, an Android application for streaming and downloading movies, TV series, anime, Asian content and livestreams. The app provides this content ad-free, without sign-up or subscription requirements. Setup instructions cover installing the base app and repositories and adding extensions.
CSS Bed is a collection of classless CSS themes intended as starting points in web development. The site presents themes by name and notes that classless themes are responsive, have good browser support, are small, and require no learning curve for HTML users.
CSS Speedrun is a small web app for testing CSS knowledge. Users enter the CSS selector that applies to all elements marked with an arrow, and a timer starts after the first puzzle is solved correctly. It presents 10 puzzles, and users can view their results or check the GitHub repository to create their own puzzles.
Customizable Skin, also known as Fluent-Metro, is an open source Start menu skin for the Open-Shell project, hosted on GitHub by developer bonzibudd. It is designed to be modern and highly customizable to align with user preferences.