Apps similar to grepai include grepWin, which is free and open source. Other options are grep and UniversalCodeGrep. In total there are three File Search Utilities like grepai for Mac, Windows and Linux.
grepWin is a simple search and replace tool which can use PCRE regular expressions to search for strings of text within files. grepWin adds an entry to the shell context menu to easily search selected folders.
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grep is a command-line utility for searching plain-text data sets for lines matching a regular expression.
UniversalCodeGrep (ucg) is an extremely fast grep-like tool specialized for searching large bodies of source code. It is intended to be largely command-line compatible with Ack, to some extent with ag, and where appropriate with grep.
