Yep, let me add an example link to complement your comment: https://apps.ubuntu.com/cat/applications/braid/ https://apps.ubuntu.com/cat/applications/braid/ I

Yep, let me add an example link to complement your comment: https://apps.ubuntu.com/cat/applications/braid/ https://apps.ubuntu.com/cat/applications/braid/ I don't know how big is that, if Ubuntu users are really buying applications. EDIT: the apt:// URI triggers the Ubuntu Software Center that looks like this http://i.imgur.com/UL3dq.png http://i.imgur.com/UL3dq.png