Anyone have a list of mobile tracking options?

I'm curious as to how many options there are. Everything I've researched so far only offer paid subscriptions like iMobiTrax and STM.

Also, are there any free mobile trackers out there?

Get voluum if you're looking for a free one, and they are free until their beta is over(extended their beta and can get 118 days free if you sign up today).

But you would still need to invest few $$ in domain and hosting stuff.