Thanks to Atom not being really free software and people here suggesting it a lot I give LightTable a try. I'm an emacs user but I like experimenting different foss editors and LighTable + emacs keybindings plugin is a really nice and beautiful tool.

Couldn't get it to work on Debian Wheezy yet (GLIBC_2.15 not found)* but worked on a Windows machine at work so I'm testing it there. I'll get back to linux later. Looking forward for v1.0. :)

* It seems to be a known issue: https://github.com/LightTable/LightTable/issues/972