- vim-fugitive
massively awesome git integration, see this screencast: http://vimcasts.org/episodes/fugitive-vim---a-complement-to-command-line-git/
- Syntastic
lint/syntax checker
- clang_complete
use LLVM to generate AST for code completion
- ultisnips
best snippet engine
- vim-snippets
snippet repository shared by all vim snippet engines
- ctrlp-funky
jump to functions in file
- delimitMate
autocomplete (), {}, <> etc smartly
- recover.vim
auto-diff to check if backup differs from file on disk
- undotree
visualize and interact with the undotree
- vim-space
makes space a repeater for f/F/t/T/n/N/etc motions
- Enter-Indent
proper indentation when pressing enter after { (usually)
- vim-repeat
make some vim plugins work well with the . command (:h . if you don't already know! Super important!)
- vim-bufsurf
proper back/forward commands (like browser tabs)
- vim-fswitch
switch between cpp/h files (not super great but better than nothing)
- vim-commentary
language-aware comment/uncomment keybinds
- vim-surround
shortcuts for ((surrounding)) <things with "things">
- neocomplete
(imo) best auto-completion engine, works well with clang_complete and ultisnips (see my vimrc)