So, this Ubuntu software center comes with 100s of applications of all types.
In this version they have disabled rating, making it hard to find how good it is.
I found gnome-shell today, that seemed awesome. There are other ones, less well known, For eg, Abiword is far better than Open Office Org Word processor in many ways. (Altho' I dont like word processors themselves.)
What are the other less well known applications that you use and like. One application per answer.