Just a big ole list of interesting projects I've seen, but haven't used.

https://radicale.org/v3.html

Simple and easy caldav and cardav server.

https://gitlab.com/WhyNotHugo/darkman/

auto light/dark mode

https://github.com/shmux/shmux

When you have multiple machines, sometimes you’ll want to run the same commands on all of them. There are many tools for this job, starting from simple for loops on the shell to full-fledged configuration management systems such as Puppet or Chef. shmux is a compromise. Give it a list of hosts and you have a shell connected to all of them to run commands. It handles errors gracefully by asking you what to do.

https://github.com/FiloSottile/age

A simple, modern and secure file encryption tool, format, and Go library.

https://github.com/silentbicycle/guff

Guff reads a stream of points from a file / stdin and plots them.

https://jedisct1.github.io/minisign/

A dead simple tool to sign files and verify signatures.

https://hund.tty1.se/2020/08/12/how-to-sync-and-manage-your-caldav-and-carddav-via-the-terminal.html

Programs for syncing a calendar and addressbook with CalDAV.

https://sr.ht/~psic4t/qcal/

Perhaps better tools for syncing calendar and addressbook (address book is a seperate tool by the same author).

https://sr.ht/~pixelherodev/DSM-9/

https://github.com/jtvaughan/oboeta

Simple collection of tools for using flashcards.

https://cj.rs/blog/putting-readmes-on-your-static-site/

An AWK script for using a project readme in your site generator.

gyosu

Documentation generator for c. Still in early development.

https://github.com/maaslalani/slides

Terminal based presentation tool. Uses markdown.

https://github.com/fogleman/nes

NES Emulator written in go.

https://github.com/shazow/ssh-chat

Chat over ssh written in go.

https://github.com/foxcpp/maddy

Simple all in one mail server in go. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC and more.

https://github.com/antonmedv/countdown

Terminal countdown timer.

https://github.com/evanmiller/hecate

The Hex Editor From Hell!

https://github.com/XAMPPRocky/tokei

Fast lines of code counter.

https://tmate.io/

Instant terminal sharing. Basically screenshare, but for terminals.

https://github.com/Wilfred/difftastic

Difftastic is an experimental diff tool that compares files based on their syntax.

https://github.com/rcoh/angle-grinder

Processing and analyzing logs.

https://github.com/sharkdp/hyperfine

Benchmark commandline tools.

https://github.com/schollz/croc

Yet another clone of magic wormhole. This one has a better cli and a progress bar.