Yes, both FollowerSearch and Flocknet offer a Free Trial.
FollowerSearch is designed for Large Enterprises, Medium Business and Small Business.
Flocknet is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for FollowerSearch Starts at $14.50/Month when Billed Yearly whereas for Flocknet Starts at $5/Month.
Some top alternatives to FollowerSearch includes BuzzSumo, Twitter Analytics, NetBase, Followerwonk, Twitonomy, Tweet Archivist, SocialTracker, Planable, SocialStats, SocialBee, Tweetastic and Tweepsmap.
Some top alternatives to Flocknet includes FollowerSearch, Social Opinion, Twitonomy, yatta! analytics, Tweetastic, Tweet Niche, Qualified, Workvivo, Create Target Audience, IFTTT and MentionMe.