Yes, both Walls.io and SocialBu offer a Free Trial.
Walls.io is designed for Large Enterprises, Medium Business and Small Business.
SocialBu is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Walls.io Starts at $200/Month when Billed Yearly whereas for SocialBu Starts at $6.70/Month when Billed Yearly.
Some top alternatives to Walls.io includes Zoho Social, Crowdfire, SocialBee, Social Media Wall, Planable, SocialMgr, Later, SocialBu, ShareSpring, Social Web Suite, Socialdraft, CloudSocial, SocialHub, Send Social Media and Wallzoe.
Some top alternatives to SocialBu includes Zoho Social, Crowdfire, SocialBee, Planable, SocialMgr, Later, SocialPilot, MavSocial, Broadcast, Ultimate SMM, Social Mako, CloudSocial, SocialHub, SocialGest and Send Social Media.