Underpass App Company
By Jeff Johnson
Underpass App Company is a sole proprietorship run by Jeff Johnson, an independent Mac app developer. Jeff was a longtime engineer at Rogue Amoeba Software, and before then worked on apps such as Knox (originally developed by MK&C, later sold to AgileBits) and the open source RSS reader Vienna. Jeff is also famous for solving the Mac OCSP appocalypse.
StopTheMadness
Take back your web browser
Mac App Icon
Mac App Store Badge
Link Unshortener
Reveal the real URL
Mac App Icon
Mac App Store Badge
Tweaks for Twitter
Better Twitter in your browser
Mac App Icon
Mac App Store Badge
Underpass
P2P encrypted file transfer & chat
Mac App Icon
Mac App Store Badge   App Store Badge

Jeff's free open source utilities:
StopTheNews
Stop Safari from opening News app
StopTheMacAppStore
Stop Safari from opening App Store app
StopTheTwitter
Stop "Open in the Twitter app" in Safari