Yes, both TeamViewer and Atera offer a Free Trial.
TeamViewer is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Atera is designed for Large Enterprises, Medium Business and Small Business.
Pricing for TeamViewer Starts at $9/month when yearly whereas for Atera Starts at $129/user/month when monthly.
Some top alternatives to TeamViewer includes NinjaOne (NinjaRMM), GoToMyPC, RemotePC, VNC Connect, RemoteToPC, AnyDesk, Splashtop Remote Support, LogMeIn Pro, Splashtop Business Access, FixMe.IT, LogMeIn Rescue and GoTo Resolve.
Some top alternatives to Atera includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, ConnectWise Control, Freshservice, ManageEngine Desktop Central, Freshdesk, Motadata HelpDesk, HelpDesk, Jitbit Helpdesk, Syncro, ManageEngine OpManager MSP, Datto RMM, ConnectWise Automate and NinjaOne (NinjaRMM).