Yes, both Offer18 and AffTrack offer a Free Trial.
Offer18 is designed for Large Enterprises, Medium Business and Small Business.
AffTrack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Offer18 Starts at $49/Month whereas for AffTrack Starts at $199/Month.
Some top alternatives to Offer18 includes AffTrack, Post Affiliate Pro, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affiliatics, Evotrack and Trackdesk.
Some top alternatives to AffTrack includes Affise, Post Affiliate Pro, ClickInc, TrackingDesk, Everflow, Refersion, Affiliatise, OffersHub, Affiliatics and Sir Filiate.