Yes, both Mention List and Flocknet offer a Free Trial.
Mention List is designed for Large Enterprises, Medium Business and Small Business.
Flocknet is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Mention List Starts at $16.58/Month when Billed Yearly whereas for Flocknet Starts at $5/Month.
Some top alternatives to Mention List includes Twitter Analytics, Twitonomy, Mention, Planable, SocialBee, Mentioned, Twitter Ads, Tweet Niche, Create Target Audience, Mentioned By and MentionMe.
Some top alternatives to Flocknet includes FollowerSearch, Social Opinion, Twitonomy, yatta! analytics, Tweetastic, Tweet Niche, Qualified, Workvivo, Create Target Audience, IFTTT and MentionMe.