Tabletopia
A commercial online tabletop sandbox and publishing platform with a Workshop, 3D pieces, multiplayer rooms, a large game catalog, browser access, and apps.
Why use it
Designers can build presentation-ready remote prototypes, invite testers, and observe rules comprehension under free-form manipulation.
Where it fits
Use prototypes and playtests to find core experience problems while they are still cheap to fix.
What to check
Free access, Workshop, and commercial publishing have different terms; uploaders need all rights, and 3D handling or platform audiences do not replace physical-table tests.