Way too many to list all of them, but the most used would be:
Home
Firefox
Open Office
Foobar 2K
Calbre
Sony Reader software
Adobe Digital Editions
Spider Solitaire
a couple of Python scripts ....
Work
Firefox
Open Office
Foobar 2K
IE 7
IE 6
Ultra Edit
MS IIS
MS Exchange
MS SQL Server (enterprise manager and query analyzer)
Linux FTP
bind (DNS stuff in Linux)
Postfix (email stuff in Linux)
irfanview
MS Outlook
Mozilla Thunderbird
putty
winscp
filezilla
ws ftp
nagios and cacti
beyond compare
adobe reader
trillian
malware bytes
spybot
...
That is the short list, like most everyone else I could go on for a while with "everything"