Adventurer's Codex is described as 'A fun, easy to use, Open Source tool for tabletop RPG players to manage their characters, campaigns, and parties. The goal is to help you focus more on the game by bringing your paper character sheets into the 21st century' and is an website in the Office & Productivity category. There are more than 10 alternatives to Adventurer's Codex, not only websites but also apps for a variety of platforms, including Windows, Mac, Android and iPhone. The best alternative is Roll20, which is free. Other great sites and apps similar to Adventurer's Codex are D&D Beyond (Freemium), Fantasy Grounds (Paid), Astral Tabletop (Freemium) and Beyond Tabletop (Free).
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!
Beyond Tabletop is a set of tools for RPG players with easy-to-use online character sheets and maps. Subscription-free and designed to be used on all devices online. Currently offering a battle map and character sheets for Pathfinder and D&D 5e.
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.
PlanarAlly is a web tool that adds virtual battlemaps with various extras to your D&D toolbox. Self hosting, Offline support, Simple layers, Infinite canvas, Dynamic lighting, Player vision, Initiative tracker. Free to use and is open source.
TaleSpire is an online, digital, graphical way of playing classic P&P Role-playing games with your friends. As a DM, build your campaign in-game and invite your players for sessions. To your left you can watch one of our streams to see for yourself.
Battlegrounds: RPG Edition (aka BRPG) is virtual tabletop software designed to enhance your pen-and-paper roleplaying games, whether your players are in the same room, or on the other side of the world.