Yes, both Sendible and Later offer a Free Trial.
Sendible is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Later is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Sendible Starts at $25/Month when Billed Yearly whereas for Later Starts at $12.50/Month when Billed Yearly.
Some top alternatives to Sendible includes Crowdfire, SocialBee, Loomly, Zoho Social, Hootsuite, Sprout Social, Planable, SocialMgr, Later, SocialPilot, Spredfast, Socialdraft, CloudSocial, SocialHub and SendPilot.
Some top alternatives to Later includes Crowdfire, SocialBee, Social Insight, Postcron, SocialMgr, SocialPilot, Sked Social, Socialdraft, InoSocial, CloudSocial, SocialHub and SocialGest.
