Vimper is a Vim based IDE, a set of plugins to enable creation of development projects. There are a lot of useful plugins available, but you need to run around to gather them. Vimper gathers a lot of these plugins into one package and extend or add new.
syncped is a SYNChronizing Portable EDitor supporting more than 100 programming languages, is available under Windows, Linux and OSX, has a vi compatibility mode, and can be configured to work with most version control systems.