grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Sass - Syntatically Awesome Style Sheets
PowerGREP - Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...
PostCSS - Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
dnGREP - dnGrep allows you to search across files with easy-to-read results.
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS