For a long time now I've been using Vundle to manage my vim plugins. As best I can make out this basically just organizes plugins in an isolated directory structure and keeps track of updating them against source URLs where normally the plugin would be manually arranged side by side in the plugins directory.
I've run across several references to using the same plugins under multiple plugin managers. NeoBundle for example seems to use the same plugins. However there seem to be a number of other plugin managers out there. Are all of these compatible in the sense that they all use the same source files or do the plugins have to be specially prepared in order to be compatible with each manager? Asked another way, Which other plugin managers are interchangeable enough that they would handle my current Vundle plugins and/or what plugin formats can I assume are Vundle manageable even if they advertise under a different manager?