rsnapshot is a filesystem snapshot utility for making backups of local and remote systems. Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals. Depending on your configuration, it is quite possible to set up in just a few minutes. Files can be restored by the users who own them, without the root user getting involved. There are no tapes to change, so once it's set up, your backups can happen automatically untouched by human hands. And because rsnapshot only keeps a fixed (but configurable) number of snapshots, the amount of disk space used will not continuously grow. rsnapshot is written entirely in Perl.

Debian package for the ZFS file system.

Start of a series of blog articles about linkers.

Interesting essays about software design.

Announcement of "Tricki", a collection of mathematical knowledge. Sounds interesting, despite the delay.

Some notes on David McClains DSP software. Check whether I still have a copy.

A styx/9p2000 file server that accesses files over http/webdav.

Geoid models.

Matlab/Octave code for interfacing with Google earth.