Yes, both Slack and Splash offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Splash is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Slack Starts at $2.67/Month whereas for Splash Starts at $12,500/Year.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to Splash includes Event Always, V-Tour, VES Virtual, Eventsforce, EventX, Virtualive, Event Anywhere, Communique Virtual Event Platform, Eventmix and Eventplus.