David Ehlers

These two open source scripts are very useful when combined with cron:

s3 Tools : http://sourceforge.net/projects/s3tools/

OpenSource tools to access Amazon S3 file storage. s3cmd - unix-like tools to manipulate stored files from the command line, s3fuse - driver to mount the S3 storage locally.

and

automysqlbackup : http://sourceforge.net/projects/automysqlbackup/

A script to take daily, weekly and monthly backups of your MySQL databases using mysqldump. Features - Backup mutiple databases - Single backup file or to a seperate file for each DB - Compress backup files - Backup remote servers

I love this “shell” interface to google.

http://goosh.org/

Not exactly sure if it is the “Top 40 Free Downloadable Open Source Social Networking Software” but worth a mention…link