shell

Compact, easy to read.

I replaced Yakuake with Guake even on KDE. Although Konsole is excellent as a windowed terminal, Guake is faster to swing down. IT has plenty of excellent colour schemes, and if you like to copy one, it's easy enough to use 'gpick' to copy and enter the colours yourself - so mine matches my teal...

Best Javascript support, since it's based on Firefox.