Yes, both Zencastr and Riverside.fm offer a Free Trial.
Zencastr is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Riverside.fm is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Zencastr Starts at $18/Month when Billed Yearly whereas for Riverside.fm Starts at $7.50/Month when Billed Yearly.
Some top alternatives to Zencastr includes StreamYard, SquadCast, Spreaker, Buzzsprout, Qualified, Workvivo, Riverside.fm, Anchor, Sounder, Casted and intrakt.
Some top alternatives to Riverside.fm includes StreamYard, Clips by Riverside.fm, Stream Club, Streann Studio, SquadCast, Rumble Studio, Qualified, Streamfizz, Workvivo, Streamr, Zencastr and RSS.