gTove is described as 'lightweight web application to simulate a virtual tabletop. Multiple maps and standee-style miniatures can be placed on the tabletop, and everyone connected to the same tabletop can see them and move the miniatures around'. There are three alternatives to gTove, not only websites but also apps for a variety of platforms, including Linux, Windows, Self-Hosted solutions and SaaS. The best alternative is Roll20, which is free. Other great sites and apps similar to gTove are Foundry Virtual Tabletop (Paid) and Rolisteam (Free, Open Source).
Roll20 is the free, easy way to play tabletop games (such as pen and paper RPGs) online with others. It's completely web-based, so it runs right in your browser. It supports video and voice chat, background music, character sheets, a massive art library, and more!
Foundry VTT is a standalone application built for experiencing multiplayer tabletop RPGs using a feature-rich and modern self-hosted application where your players connect directly through the browser.
Rolisteam helps you to manage tabletop role playing games with remote friends/players. It provides many features to share maps, pictures and it also includes tool to communicate with your friends/players.