A list of the above.
Passively capture, archive, and hoard your web browsing history, including the contents of the pages you visit, for later offline viewing, mirroring, and/or indexing. Your own personal private Wayback Machine that can also archive HTTP POST requests and responses, as well as most other HTTP-level data.
Fetch, flag/mark, delete/expire, and perform other batch operations on messages residing on IMAP servers. A very fast KISS mail fetcher with cool security and convenience features.
List contents of, unpack, and convert Android Backup files to TAR files and back, decrypt, encrypt, split them into by-app pieces, etc. Android Backup files are backup.ab, *.ab, *.adb, and similarly named files produced by adb backup, bmgr, and similar tools.
A bunch of stuff in Nixpkgs and NixOS
Nixpkgs (also this link) is a package collection for the Nix package manager. NixOS is a GNU/Linux distribution based on Nix and Nixpkgs.
See the list of contributions at GitHub and another list of contributions at GitHub to now deprecated repository (before NixOS became a part of Nixpkgs). Before Nixpkgs and NixOS moved to GitHub I was contributing patches to the mailing list (archived at https://nixos.org/nix-dev/). The very first contribution there is the message with Message-Id: <20120626165234.1f9f3f04b630fabf52438a54@oxij.org> and Date: Tue, 26 Jun 2012 16:52:34 +0400 (archived at https://nixos.org/nix-dev/2012-June/009215.html).
SLNOS which a fork of Nixpkgs/NixOS that tries to adhere to the KISS principle. In particular, uses s6 instead of systemd. Uses some of the software made by the Suckless.org.
libcardiacarrest which is a trivial implementation of libpulse* PulseAudio library API that unconditionally (but gracefully) fails to connect to the PulseAudio daemon and does nothing else. I’m the original author of this project.
slim-ng which is a maintained continuation of the original SLiM login manager (aka display manager).
My fork of PyTox which is a maintained continuation of the original PyTox library, which is a library providing Python bindings for c-toxcore.
org-mode for GNU Emacs which is a Emacs mode for keeping notes, maintaining TODO lists, planning projects, authoring documents, clocking time spend doing things, gathering statistics, etc.
Basically, as a file format, org-mode files are Markdown on steroids. Emacs’ org-mode major mode is a monumental piece of software that, among other things, allows to structurally edit and to programmatically extract information from org-mode files (e.g., “show me all the things in my org-mode files marked as TODO scheduled for today”).
notmuch and its mode for GNU Emacs which is global-search and tag-based email system.
For the list of contributions you’ll have to search the mailing list.
c-toxcore which in a C implementation of the Tox instant messaging protocol.
See the list of contributions at GitHub. See also PyTox above.
git-hub which is a sane command-line interface for GitHub.
See the list of contributions at GitHub.