dnGrep allows you to search across files with easy-to-read results.

AstroGrep is a Windows grep utility that supports regular expressions, context lines, and advanced search options.

BareGrep is a free file finding and text searching tool.

glogg is a multi-platform GUI application to browse and search through long or complex log files.

PowerGREP is a powerful Windows grep tool for searching through files and folder, performing complex search and replace operations.