gitg

Git GUI which can be used to visualize git branches and commit histories.

sudo apt-get install gitg

terminator

A better terminal which allows for window splitting, hotkeys, and more.

sudo apt-get install terminator

case insensitive autocomplete in terminal

if [ ! -a ~/.inputrc ]; then echo '$include /etc/inputrc' > ~/.inputrc; fi
echo 'set completion-ignore-case On' >> ~/.inputrc

meld

Visualize file diffs

sudo apt-get install meld

htop

Interactive system-monitor, process-viewer, and process-manager

sudo apt-get install htop