Link

iOS

• appstat
  Get AppStore apps reviews, and rankings worldwide for every category.
• Houston
  Houston is a simple gem for sending Apple Push Notifications. Pass your credentials, construct your message, and send it.
• Unused
  A Mac app for checking Xcode projects for unused resources
• watchbuild
  Get a notification once your iTunes Connect build is finished processing

Ruby

• The Ruby Toolbox – Know Your Options!