Sampler - Visualization dashboard for any shell command.
WTFUtil - The personal information dashboard for your terminal.
termui - Fully-customizable terminal dashboard and widget library in Go.
mtm - Perhaps the smallest useful terminal multiplexer in the world.
byobu - Byobu is a GPLv3 open source text-based window manager and terminal multiplexer.
Kontakt - With KONTAKT 6, you can sound like a snare drum, a symphony orchestra, or anything in between, from a universe of sampled instruments.