Yes, both Ek Link and Offer18 offer a Free Trial.
Ek Link is designed for Medium Business and Small Business.
Offer18 is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Ek Link Starts at $5/Month whereas for Offer18 Starts at $49/Month.
Some top alternatives to Ek Link includes TrackingDesk, Everflow, RedTrack.io, Refersion, Affiliatise, OffersHub, Offer18, Affiliatics and Trackdesk.
Some top alternatives to Offer18 includes AffTrack, Post Affiliate Pro, TrackingDesk, Refersion, Affiliatise, TUNE, OffersHub, Affiliatics, Evotrack and Trackdesk.