1. WheelDon't reinvent the wheel for every new Rails project. Use sane Defaults.
2. Admin dataA non instrusive gem which helps you browse, search and manage your data using browser
3. exception2dblog rails exceptions to database when you can't use hoptoad because of privacy reasons. You still get to use hoptoad_notifier and hoptoad API . However the exception data gets saved in a database instead of going to hoptoad.