ManyHit is described as 'Free Traffic Exchange. $1 Minimum cashout (Payza/Paypal). Earn 10% cash from referral. Earn 10% credit from referral. Dynamic exchange rate. Auto Surf'. There are more than 25 alternatives to ManyHit, not only websites but also apps for a variety of platforms, including Windows, SaaS, iPhone and Chrome OS. The best alternative is Rite.ly. It's not free, so if you're looking for a free alternative, you could try Easyhits4u or Hit4Hit. Other great sites and apps similar to ManyHit are Blanq (Paid), eBesucher (Freemium), Yibbida (Freemium) and sniply (Paid).
Exitbar.io is a free link shortener that allows you to add your Call-To-Action to any content you want. It has a lot of features and animations to customise your message. And is absolutely free without registration.