You can download applications in several categories.

Windows

Add-on
click for info
Description
SETI@BOINCWatch(.NET 2.0) A SETI@Home/BOINC client watcher! User statistics powered by BOINCStats. But now built with the .NET environment.
SETISpirit SETIspirit is free add-on tool for SETI@home users which provides information about the tasks, the SETI@home project status, workunits and credits, statistic charts and a detailed sky map.
BOINCcalculator Show details of CPDN jobs
BES Control max CPU usage and prevent overheating (not specific to BOINC)
BoincLogX BoincLogX creates detailed logfiles for all BOINC projects.
SETI@BOINCWatch(.NET) A SETI@Home/BOINC client watcher! User statistics powered by BOINCStats. But now built with the .NET environment.
BOINC Client Configuration Windows GUI for editing the client configuration file
SQL Setup for BoincSpy Stores Workunits into SQL database
BoincView Advanced BOINC manager for networks
SETI@home-MapView SETI@home-Mapview creates skymaps for the BOINC projects SETI@home-II, Einstein@home and Astropulse.
ThreadMaster Control max CPU usage and prevent overheating (not specific to BOINC)
TThrottle TThrottle throttles CPU usage to keep its temperature below a limit you select.
BoincSpy Views BOINC project statistics
CPDNSpy Stats/Benchmarkprogram. Only for CPDN!!!
SETI@BOINCWatch A SETI@Home/BOINC client watcher! User statistics powered by BOINCStats
BOINC Monitor A desktop gadget that shows the status of running tasks
BoincTasks An advanced and powerful BOINC GUI

Linux

Add-on
click for info
Description
boinc-suse Init script for SuSE 9.2 and 9.3
boinctop top like view of boinc status
BoincTasks An advanced and powerful BOINC GUI (requires Wine)
BOINCTail BOINCTail displays the status of jobs running in the BOINC environment in a 'tail-like' way.
BOINC Monitor Plasmoid to show BOINC status on the KDE desktop
KBoingMgr A Linux/KDE replacement for the standard BOINC Manager
Boinctray A system tray application for monitoring the BOINC client
boinctui Fullscreen text mode manager for BOINC
Boinc bash script Boinc state displayer
SETI@Boinc Tracker SETI@Boinc Tracker is a GUI Client for Tracking Boinc CLI Client!
BOINCprog A BOINC project progress monitor
MultiTail Multitail shows several simultaneous tails in different curses windows.
rc.boinc (Slackware) rc.boinc - Slackware Startup Script
BOINCSTAT Command line view of BOINC status
CPU limiter Limits the CPU usage (good for laptops)
boincctl Script to start boinc at boot time.

Mac

Add-on
click for info
Description
Seti Check Revolutions Boinc state displayer. Only for seti@home!
CPDNSpy Linux/Mac Stats/Benchmarkprogram. Only for CPDN!!!
BoincTasks An advanced and powerful BOINC GUI (requires Wine)
BOINCMenubar 2 Mac GUI for BOINC
SETI@Boinc Tracker SETI@Boinc Tracker is a GUI Client for Tracking Boinc CLI Client!
BOINC Statistics Lets you check BOINC stats from the Mac OS X Dashboard

Mobile

Add-on
click for info
Description
AndroBOINC BOINC graphical interface for Android devices
BoincTasks Mobile BOINC graphical interface for mobile devices (Android, iPhone, iPad)

Web browser toolbars and plugins

Add-on
click for info
Description
BOINC Server Status Yahoo! widget adds the BOINC Online Scheduler image to your desktop.
BOINC User Statistics Widget Widget displays statistics for BOINC projects (requires the Yahoo! widget engine)
SAH User Statistics An extension for Firefox (works only with 1.0 to 1.5; may work under Mozilla) that displays your stats for SAH
BOINC Statistics Shows your statistics for any BOINC project (requires the Yahoo! widget engine)

Web applications

Add-on
click for info
Description
Progress Thru Processors Facebook-based interface to BOINC
BOINC Milestones Facebook application that posts credit milestones in your Status
Forum signature showing jobs in progress A PHP script that generates a forum signature showing jobs in progress
BoincPHP5-GUI Monitor and control Boinc from a web browser
Boinc LCS Shows the current state and other information from an unlimited number of BOINC clients connected to the Internet.
SETI@home/BOINC progress status Show your SETI@home/BOINC progress on your homepage
GOINC GOINC: A Google homepage module for keeping tabs on BOINC.