Yes, both TweetNest and BuzzSumo offer a Free Trial.
TweetNest is designed for Large Enterprises, Medium Business and Small Business.
BuzzSumo is designed for Large Enterprises, Medium Business and Small Business.
Pricing for TweetNest Starts at $15.99/Month whereas for BuzzSumo Starts at $79/Month when Billed Yearly.
Some top alternatives to TweetNest includes FollowerSearch, BuzzSumo, Twitter Analytics, NetBase, Twitonomy, Planable, Hypegrowth, SocialBee, BTweeps, Twitter Ads, Tweelog and Tweepsmap.
Some top alternatives to BuzzSumo includes ListenFirst, Sprinklr, Hootsuite, Sprout Social, Planable, ShareSpring, Socialinsider, SocialBee, GetSocial, Nudge and Blogalyzer.