SBackup is a Simple Backup solution for Linux. It is generally developed with a Gnome desktop in mind, but will also work in other desktop environments and also on the console.
PDF-Shuffler is a small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop and rearrange their pages using an interactive and intuitive graphical interface.
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GDecrypt is a small piece of software written in Python for making your life with LUKS- or TrueCrypt-Partitions under linux easier. I.E. creation of Luks-encrypted partitions.