I use
WD
WDL
AIS Ship tracking (comar 200N) - uploads data various sites
Kinectic Airplane tracker - uploads data various sites
Blackcat GM10 Geiger counter
IP webcams - webcams of the beach
Digital Atmosphere - trial at present, dont think its realiable, does not update maps most of the time
Current Cost - shows how much electric you are using
Some php scripts like sunspots I wrote
Expect I have forgotten some to

The ships and planes is good, but in either case you dont need to have your own equipment , geiger counter hopefully that wont cause an alarm.
I always try to go for network connection kit rather than USB stuff.
Would like to add WXsim, Boltek, solar sensors....