ack.vim
Vim plugin for the Perl module / CLI script 'ack'
...This plugin was designed as a Vim frontend for the programmer's search tool ack. ack can be used as a replacement for 99% of the uses of grep. The plugin allows you to search with ack from within Vim and shows the results in a split window. But here's a little secret for the Vim-seasoned: it's just a light wrapper for Vim's grepprg and the quickfix window for match results. This makes it easy to integrate with your own Vim configuration and use existing knowledge of core features. It also means the plugin is flexible to use with other search tools.