I have written a few pieces of software for fun. You can find the links below.

A tutorial

• How to package a userstyle for Chrome

Recent projects

• Follow Back Chrome extension — Displays whether a Twitter user follows you.
• Facebook Like Chrome extension — A like button for everything.
• Click to Expand Chrome extension — Click to expand short urls.
• Follow Cost Chrome extension — Tells you how annoying a Twitter user is.
• Bleeding-Edge Chromium — a Chromium updater.
• gmailto — mailto links for Gmail and Mac users.

Old, but not yet obsolete projects:

• Tweeters You May Know — A friend finder for Twitter.
• Facile — Facebook status updater and reader for OS X.  Seriously underdeveloped.

Very old, obsolete projects:

• GROSX — A Google Reader notifier for Mac OS X (dead, derivative development ongoing here).
• YMail.app — A Yahoo! Mail notifier for Mac OS X (no longer actively maintained).