Yes, both Social Combiner and FollowerSearch offer a Free Trial.
Social Combiner is designed for Freelancers, Medium Business and Small Business.
FollowerSearch is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Social Combiner Starts at $19/Month whereas for FollowerSearch Starts at $14.50/Month when Billed Yearly.
Some top alternatives to Social Combiner includes Zoho Social, Crowdfire, SocialBee, Iconosquare, TrueSocialMetrics, SocialTracker, Buffer, Analisa.io, Planable, Later, Gramreports, ThoughtMetric, SocialStats, SocialGest and Sharemyinsights.
Some top alternatives to FollowerSearch includes BuzzSumo, Twitter Analytics, NetBase, Followerwonk, Twitonomy, Tweet Archivist, SocialTracker, Planable, SocialStats, SocialBee, Tweetastic and Tweepsmap.