Do you need to install software to run these?
I see they only bring in 0.6 eur a day (4mhs).. They cant be run on public computers when there needs to be software installed, right?

Wow man...
0.6E a day seems like a pretty good stuff to me...
You will need to run a computer.. That consumes power. Would the electricity for a computer cost 0.6 euro per day? Maybe. If not, there's not much left from the 0.6 a day.
raspberry pi takes about 7 a year if your electricity is same expensive as here (0.28/KW/h) (maybe 8$) .. you are still good to go with 0.60$ a day
C'mon, you people. Most of us are running GPU mining rigs already. Multi-talk those suckers! Dual mine on the GPUs, BURST or STORJ on the hard drive, and Scrypt on the USB. Maybe a little Cryptonight on the CPU.
Your PC can handle it.