Sharegate is described as 'simplifies the migration and management of SharePoint, Office 365, and OneDrive for Business for thousands of administrators and power users around the world' and is an app in the Network & Admin category. There are five alternatives to Sharegate for Online / Web-based, Windows, iPhone, Self-Hosted solutions and SaaS. The best alternative is Saketa Migrator, which is free. Other great apps like Sharegate are SPDocKit (Paid), Cloud FastPath (Paid), SkySync (Paid) and AvePoint (Paid).
SPDocKit is the ultimate SharePoint management and administration tool for generating SharePoint farm documentation. SPDocKit helps with SharePoint reporting, analytics, auditing and helps optimize farm performance based on Microsoft best practices.
SkySync is an enterprise content integration and orchestration platform that empowers organizations with enhanced business and IT agility—rapidly migrating files across your network of storage repositories at incredible speed and scale.