Yes, both Interact and Yammer offer a Free Trial.
Interact is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Yammer is designed for Large Enterprises, Medium Business and Small Business.
Pricing details for both Interact and Yammer are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to Interact includes Campaigner, Moosend and SMTP.
Some top alternatives to Yammer includes Interact, Interact Software, MyHub Intranet Software, Creative Social Intranet, Attollo Intranet, Oak Engage, Engynn Intranet and OneWindow Workplace.