Surrparen is a project mainly written in Vim Script, it's free.
Hilights a pair of parens/braces that surround the cursor
This is a mirror of http://www.vim.org/scripts/script.php?script_id=1753
The surrparen plugin hilights a pair of parens/braces that surround the cursor position automatically. Unlike the matchparen.vim, it works even when the cursor is not just on a paren/brace. It's useful especially for texts that have many parens like lisp source.