Selectwm is a simple but robust program that will let you pick a window manager (or other executable) to run at X startup, and optionally after a window manager exits. It uses the GTK+ toolkit, and includes options like a timer to start the default window manager, and modification of the window manager list from within selectwm.
Guiftp is a simple FTP client using the GTK+ toolkit. It actually can connect to a remote host, download and upload files and directories. It supports interrupted transfer. Bookmarks are working. And you can do the usual operations: erase files and directories, create directories, erase directories recursively... on both the local and the remote computer.
A backup script. Usage: "backup.pl --conf dir --ecrire cd" where "dir/cd/" is a directory containing symlinks to the real data to backup. The script accepts other options but for now you have to speak french to understand them ;-)