Mutate

I'm not familiar with these personally, but: http://do.cooperteam.net/ Gnome Do looks like a Quicksilver clone. Seems stalled for a year. https://github.com/ManuelSchneid3r/albert Alfred-inspired, though possibly moving a little slow (no updates for a month, and those were readme/packaging). Claims to have a major refactor coming out this month. https://github.com/qdore/Mutate Alfred-inspired, looks active. Mutate might be what I'd hitch my horse to, were I ok with something bleeding edge. Unsure if it supports complex workflows, though.

Currently dual booting Ubuntu and Windows at home to get my feet wet with Linux. At work I use a Mac and the closest thing I've found to Quicksilver or Alfred is Mutate. https://github.com/qdore/Mutate

Gnome3 is also nice http://i.imgur.com/8ZxohmT.png :) [x] - I yet to have see terminal emulator shipped with ubuntu that doesn't wrap text [x] - Gnome 3 has Alfred like search over files, apps, windows... also mutate (https://github.com/qdore/Mutate)