This website contains all the lectures, project materials and tools necessary for building a general-purpose computer system and a modern software hierarchy from the ground up.

The materials are aimed at students, instructors, and self-learners. Everything is free and open-source, as long as you operate in a non-profit setting.

Portmaster is a free and open-source application firewall that does the heavy lifting for you. Restore privacy and take back control over all your computer's network activity.

Graphite is a free, open source vector and raster graphics engine, available now in alpha. Get creative with a nondestructive editing workflow that combines layer-based compositing with node-based generative design.

LibreChat AI is an open-source platform that allows users to chat and interact with various AI models through a unified interface. You can use OpenAI, Gemini, Anthropic and other AI models using their API. You may also use Ollama as an endpoint and use LibreChat to interact with local LLMs. It can be installed locally or deployed on a server.

Test and validate your robots.txt with this testing tool. Check if a URL is blocked, which statement is blocking it and for which user agent. You can also check if the resources for the page (CSS, JavaScript, images) are disallowed.

Infinite Mac is a collection of classic Macintosh and NeXT system releases and software, all easily accessible from the comfort of a (modern) web browser.

Pick any version of System Software/Mac OS or NeXTStep/OPENSTEP from the 1980s or 1990s and run it (and major software of that era) within a virtual machine. You can also run a custom version with your choice of machine and virtual disks. Files can be imported and exported using drag and drop, and System 7 and onward have more advanced integrations as well – refer to the welcome screen in each machine for more details.

Generate images from within Krita with minimal fuss: Select an area, push a button, and new content that matches your image will be generated. Or expand your canvas and fill new areas with generated content that blends right in. Text prompts are optional. No tweaking required!

Monit is a small Open Source utility for managing and monitoring Unix systems. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.

PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.

Manage your dotfiles across multiple diverse machines, securely.