Shell.NET is a set of console and winform applications written in C#. It features nearly 100 applications ranging from classical Unix applications like basename, cal, grep, tr, uniq, and wc, to some very unique tools like RunScript or TextTransform.
rtgrep is a bash script which searches for all files in the current directory or a given base directory which were created/modified within a given time period. The search can be recursive, and you can specify a pattern to be matched in the file contents