All Due Credit
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An open-source WordPress plugin. Credit those who helped by including a stylish list of names after any WordPress post, potentially including a Gravatar and link for each.
Hosted by WordPress.org.
CAL
Documentation
A web-based language center management system that is capable of tracking students, monitors, teachers, and administrators.
Created for Champlain College St. Lambert in a joint effort with Joseph Pereira. CAL has been actively used since 2006.
Notepad 82
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Created when I was 17, this program grants the TI-82 calculator the ability to save text notes. Hosted by TICalc.org.