Seems that Ivan Georgiev (baobab) is responsible at least for the following:

• CategoryIcons
• PostIcons
• PostMetaManager?
• WpWikka
• Bao WordPress CMS

He is also a humble owner of the DevCorner  Web Programming blog which covers

•  PHP tutorials and tips and  PHP Libraries
•  CSS tutorials and tips
•  JavaScript tutorials, tips and  bookmarklets
•  WordPress tutorials and tips and  WordPress plugins
• and a few other