Neither Nimbus nor PaizaCloud offers a free trial.
Nimbus is designed for Large Enterprises, Medium Business and Small Business.
PaizaCloud is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for Nimbus Starts at $3/User/Month whereas for PaizaCloud Starts at $9.80/Month.
Some top alternatives to Nimbus includes Codeanywhere, PaizaCloud, AWS Cloud9, Koding, CodeinCloud, CodeTogether, Codigo, CodeSync, CodeOnline and HackerPen.
Some top alternatives to PaizaCloud includes IntelliJ IDEA, Codeanywhere, ShiftEdit, AWS Cloud9, Koding, CodeinCloud, CodePen, CodeTogether, Codefile and Pseudocode Editor.