Yes, both Nextcloud and Rocket.Chat offer a Free Trial.
Nextcloud is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Rocket.Chat is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Rocket.Chat begins at $2/User/Month when Billed Yearly, while pricing details for Nextcloud are unavailable.
Some top alternatives to Nextcloud includes TrueConf Server, Flock, CollaborateCloud, ClickUp, Google Workspace, Google Drive, FileCloud, ownCloud.online, ownCloud, Fleekdrive and Genialcloud Facsys.
Some top alternatives to Rocket.Chat includes Slack, Glip, Google Chat, Zulip, IRCCloud, ChatWork, Dialog, CometChat, Teamwork Chat and Echo.