Yes, both Zoom and Demodesk offer a Free Trial.
Zoom is designed for Large Enterprises, Medium Business and Small Business.
Demodesk is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for Zoom Starts at $12.49/Month when Billed Yearly whereas for Demodesk Starts at $19/User/Month.
Some top alternatives to Zoom includes Livestorm, Cisco Webex Meetings, Google Meet, GotoMeeting, Cisco Webex Teams, BlueJeans Virtual Meetings, VideoMeet, Jitsi Meet, Video Window and Zip Conferencing.
Some top alternatives to Demodesk includes ScreenMeet, Zoom, NokNok, Cloudpresenter, Zip Conferencing, CrankWheel, Screenleap, Zgenda and Remote Meeting.