CastleGate is described as 'Applicant Tracking System for growing companies'. There are more than 25 alternatives to CastleGate, not only websites but also apps for a variety of platforms, including Windows, iPhone, SaaS and Mac. The best alternative is Cornerstone OnDemand, which is free. Other great sites and apps similar to CastleGate are Betterteam (Freemium), Calibrace (Paid), Crelate (Paid) and Recruiterbox (Paid).
StowHire is a simple, applicant tracking system designed for startups and small business. You can build a careers page and manage applicants without having your data/files scattered across emails and spreadsheets. Forever FREE plan available.