GM Forge is a Standalone Virtual Tabletop with competitive features, making it a good affordable alternative. When you buy a copy of GM Forge, your friends join you through their web browser without purchasing a copy. It has all the competitive features in other virtual tabletops, as well as some impressive new innovative ideas built with the average GM in mind.
GM Forge is a sandbox for GMs, and has 6 sample systems available on the workshop with some automation setup for basic play, with the option of downloading additional user created content and mods through the steam workshop!
Features
Dynamic Lighting
Worldmaps / Map connecting
Online/Offline/Local Network Support
Combat Tracker
Music and Youtube video integration
Voice/Video chat
Drag and Drop inventory/spellbook management
Automation/Auto Calculations
Custom Character Sheets
Full System Builder
Custom Dice
Custom Compendiums
Hand out building
Presentation ready notes (Automating your Notes)
Resource Pages that allow you to share your PDFs and Important images with your party
Modding/Workshop Support
And the list goes on...