Nagios-twitter is a project mainly written in Python, it's free.
small Twitter script for Nagios
Install
easy_install tweepy-1.7.1-py2.6.egg
chmod +x *.py
mv *.py /usr/local/bin
cat nagios_commands.tpl >> /etc/nagios3/objects/commands.cfg
register a new application at Twitter and use "Desktop Client" and "Read/Write Access"
copy Consumer key and secret into /usr/local/bin/twitter-python-register.py
execute /usr/local/bin/twitter-python-register.py and copy given URL into browser
enter URL and paste the PIN back to twitter-python-regiser.py
copy the Access key & secret and Consumer key & secret into /usr/local/bin/twitter-python.py
Test script with /usr/local/bin/twitter-python.py "Hello World"