Reroll alternatives

Reroll is a proprietary app for Online, Android and iPhone. It offers a free version with paid upgrades (one-time $15). Developed by Givola Labs Pte Ltd.

Alternatives

Roll20
D&D Beyond
Pcgen
Fight Club 5th Edition
Rolisteam
Talespire
Hero Lab
Battlegrounds: RPG Edition
Aurora Builder
Fantasy Grounds
Adventurer's Codex
Beyond Tabletop