Yes, both Segment and Aircall offer a Free Trial.
Segment is designed for Large Enterprises, Medium Business and Small Business.
Aircall is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Segment Starts at $120/Month whereas for Aircall Starts at $30/User/Month.
Some top alternatives to Segment includes CustomerLabs CDP, BlueConic, Captain Metrics, Zylotech, Lexer, Acquia Marketing Cloud, BSI CDP, Gravito CDP and euromessage CDP.
Some top alternatives to Aircall includes Novanet Cloud Contact Center, CloudTalk, HoduCC, Call Center Studio, Dialpad Contact Center, 3CX, Vonage Contact Center and RingCentral Contact Center.