Hashtab, is the most popular utility for validating file checksums on Windows, and now it has come to OS X!

Stationery Themes for Mail - Templates Guru provides you with 160 stationaries for Apple’s Mail. Just choose a template, add your text and photos, and send the exceptional email to your business prospect, teammate, or friend.

Total Manager is an all-in-one app to manage loads of files in an efficient way. Total Manager is a powerful file manager with a classic double-window and multi-tab interface. It is not only a professional archiving app that can easily compress, extract, and preview almost all archive files such as ZIP, RAR, 7z and more, but also supports viewing images, playing audio and video files, together with basic operation such as copy, move, rename, and delete. Moreover, you can open multiple tabs and browse local directories and archives separately at the same time. In short, it's a great file manager.