Pocketwatch
pocketwatch is a clone of the watch utility found on many UNIX-based operating systems. It exists entirely due to the fact that watch swallows CTRL-code shortcuts that aren't CTRL-C (interrupt), and as a result, makes it really difficult to use CTRL codes to navigate around terminal panes. A Ruby implementation serves the same purpose but doesn't jack up my terminal navigation.
Yes, that's the only reason this exists.
Installation
gem install pocketwatch
Usage
Usage: pocketwatch [options] -- <command>
-v, --version Print the version number
-n INTERVAL Length in seconds between command execution
License
The gem is available as open source under the terms of the MIT License.