GKrellM plugin
This GKrellM plugin, (GNU/Linux, Unix), displays a progress meter for the current workunit.
http://xavier.serpaggi.free.fr/seti/

Seti Driver
Microsoft Windows dialog based manager for processing and caching SETI@Home work units. Allows the user to download and process multiple workunits.
http://www.wakeassoc.com/setidriver/

SetiDockling
Monitors the work of clients in Mac OSX.
http://remi.zara.free.fr/mac/setidockling/

Download SETI@home
Free screensaver download for Windows, Macintosh, and command line operating systems.
http://setiathome.berkeley.edu/download.html

SETI Monitor
A free program for Windows that monitors the activity of your SETI@home client. It shows the found signals and saves the results from processed work units.
http://www.zrlm.com/highstress/setimon/

SETI spy
on the progress and performance of the SETI@home client. Site also has useful SETI@home tips and links.
http://cox-internet.com/setispy/

SETI@home XML Banner
PHP script for creating statistics banners.
http://www.visualecho.org/setibanner/

CLi@X for Seti@Home
An ActiveX plug-in for your Windows CLI Seti@Home client.
http://www.averyit.net/seti

ASeti
A Python script to keep track of the SETI@home client's progress.
http://morksida.tripod.com/aseti/

PHP SETI@home web monitor
PHP script to monitor single or multiple setiathome programs running in your workstation or server, via the local web server. [Open Source, GPL]
http://www.mariovaldez.net/software/phpsetimon/