Yes, both Tweet Ninja and Solidinbox offer a Free Trial.
Tweet Ninja is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Solidinbox is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Tweet Ninja Starts at $19/Month whereas for Solidinbox Starts at $29/Month.
Some top alternatives to Tweet Ninja includes Zoho Social, Crowdfire, SocialBee, Buffer, Planable, Later, SocialBu, Naytev, Ultimate SMM, Tweetastic, Redfeets, SocialPear, BTweeps, Twitter Ads and Tweepsmap.
Some top alternatives to Solidinbox includes hivoe, Twitter Ads, Mention List, Tweet Niche, Qualified, BypassDM, Workvivo, SuperDMs, Create Target Audience and IFTTT.