I recently released two simple WordPress plugins:
This creates a simple pet adoption search form in a widget on your WordPress site. Once you enter a postal/zip code, you're taken to results on Adopt-a-Pet.com where you can look for a homeless dog, cat or other animal waiting for your love. (Yes, I've worked a lot in the past with Adopt-a-Pet.com, but this plugin is not affiliated with or endorsed by them, I just created it for fun and to promote pet adoption.) Pull requests welcome.
This creates a simple widget display of the current U.S. national debt, based on the latest data available from the U.S. Treasury. If you want you can animate the number so that it is increasing/decreasing on the page according to recent changes in the actual debt. Pull requests welcome.
As I said, pretty simple stuff, but I enjoyed getting more acclimated to the WordPress plugin ecosystem, partly in preparation for working on some more complex plugin ideas. I've created a page about software I've worked on where future updates will go.
If you end up using one of these plugins, please consider rating it on the plugin page so others know how you like it.