1. Inconsolata
sudo apt-get install ttf-inconsolata
2. Envy Code R
http://damieng.com/blog/2008/05/26/envy-code-r-preview-7-coding-font-released
3. Droid Sans Mono
sudo apt-get install ttf-droid
4. Anonymous Pro
http://www.ms-studio.com/FontSales/anonymouspro.html
5. DejaVu Sans Mono
sudo apt-get install ttf-dejavu
6. Liberation Mono
sudo apt-get install ttf-liberation
7. Terminus
sudo apt-get install xfonts-terminus