This page will contain some useful links to some projects and things I enjoy. I hope you can find something interesting.
This list contains mostly open source/free software projects.
The Linux Command Line: A solid book for learning the command line in GNU/Linux distributions. You can download the digital version of the book for free.
Qubes OS: A distribution that aims to provide security through isolation.
Tails: A privacy- and anonymity focused distribution that implements Tor and runs as a live distribution from a USB stick, DVD or similar.
Free Software Projects
The KDE Project: A free software project/community. The community is probably best known for developing the Plasma Desktop and KDE Frameworks.
Nextcloud: A platform for hosting and sharing your data. You can extend the functionality a lot by simply installing apps.
Syncthing: Peer-to-peer file synchronization. A decentralized alternative to proprietary cloud services.
Tor Project: Anonymity online. Defend yourself against tracking and surveillance. Circumvent censorship.
Mastodon: A decentralized social network. A microblogging platform.
Information Security and Hacking
Root Me: Hacking and Information Security learning platform.
Web Security Academy: Free, online web security training from the creators of Burp Suite.
Awesome Hacking: A collection of various awesome lists for hackers, pentesters and security researchers. So a list of list of interesting stuff.
Privacy Tools: Provides knowledge and tools to protect your privacy against global mass surveillance. Find privacy and security-aware alternatives to proprietary software.
Signal: A cross-platform end-to-end-encrypted messaging application. Signal can be used for chatting one-to-one, but also to have group conversations, for sending files and have video conversations.
Edabit: Learn to code with interactive challenges.
Awesome Sysadmin: A list of sysadmin resources.
If I want to sit down, relax and read some interesting blogs, then I visit some of the ones below.
The New Oil: "Information Security for normal people". A very good blog about information security and privacy.
Open Source Musings: A blog about GNU/Linux and open source software.
Logos by Nick: Various resources for digital artists. Get better using open source software like Inkscape and GIMP.
Marko Saric's blog: A good blog about web development, privacy and tracking.
jlelse's Blog: Jan-Lukas Else's blog about software development and technology news/trends.
Julia Evans' blog: Where do I even start? She has tons of good content to read through. You can find topics such as computer networking, containerization, GNU/Linux, and open source on her blog. You can also check out her "programming zines" (comics for learning about various technical topics).