switchaudio-osx - Change the audio source for Mac OS X from the command line.
displayplacer - macOS command line utility to configure multi-display resolutions and arrangements. Essentially XRandR for macOS.
Networking
neoss - Socket statistics visualization and explanation tool for Unix systems.
Catflap - Creates a listening TCP socket and passes its FD to a child process.
curlie - Power of curl, the ease of use of httpie.
sshfs - Network filesystem client to connect to SSH servers.
sshuttle - Transparent proxy server that works as a poor man's VPN. Forwards over ssh. Doesn't require admin. Works with Linux and MacOS. Supports DNS tunneling.
temci - Advanced benchmarking tool written in Python 3 that supports setting up an environment for benchmarking and the generation of visually appealing reports.
imgur-screenshot - Take screenshot selection, upload to Imgur. + more cool things.
jq - Lightweight and flexible command-line JSON processor.
jump - Helps you navigate faster by learning your habits.
just - Handy way to save and run project-specific commands.
jc - Serializes the output of popular gnu linux command line tools and file types to structured JSON output. This allows piping of output to tools like jq.
psrecord - Record the CPU and memory activity of a process.
bottom - Cross-platform graphical process/system monitor with a customizable interface and a multitude of features.
gdu - Disk usage analyzer with console interface written in Go.
kalk - Command line calculator that supports math-like syntax with user-defined variables, functions, derivation, integration, and complex numbers. (Web) (HN)
fcp - Significantly faster alternative to the classic Unix cp command.
Renamer - Command line utility to batch-rename files via your editor.