One Realm

A portable, offline-first DM and worldbuilding tool. Build worlds, run sessions, share with others and play together, all in one app. License: CC BY-NC 4.0 · Free to use Everything core works **without an account**. You only need one to play online, publish to the marketplace, or download other users' content. /images/general-media/1791564204_7DEx9r3t.webp Worldbuilding - Era Timeline: Split your world's history into eras on a timeline bar and move between them. Each era keeps its own map, pins, nested location maps and day-by-day timeline pins linked to cards and sessions. You can show the same city before the war and after it. - Templates & Packages: Every world is built on a template (D&D 5e is built in) and pulls content from packages. A package is a bundle of cards you can install into any world, link to other packages, or share on the marketplace. Custom templates are coming. - Codex: Schema-driven cards for NPCs, monsters, spells, items, locations and more. Every reference is a tappable link. Pin cards to the top, preview any card with a long press, and search by name, tag, category or text. - World Map: Pins, grid and scale, drawing, fog of war, and nested maps you can walk into (districts, dungeons, taverns). - Mind Map: An infinite canvas with linked nodes, workspaces, freehand drawing and undo/redo. /images/general-media/1791564252_TB7zwrCp.webp Running the Session - Second Screen: Give the table its own view. Pop out a window onto a second monitor, cast to a TV or projector, or project into every connected player's app. You choose how battle maps, images, cards and PDFs go out. Fog of war and hidden tokens stay hidden. - Battle Map: The session screen *is* the map, with the encounter panel and event log on top. It has layers, fog of war, AoE templates, 5e diagonal rules, creature-sized tokens, shapes and text, a DM-only layer, hidden tokens, movement trails for the round, and two maps joined into one. - Combat Tracker: Initiative, HP (with hit-dice rolls), conditions, turn order and an event log. - 3D Dice: Dice roll across the screen with named styles. Skills and saving throws roll from the character sheet with one tap. - Soundpad: Layered ambience with gapless loops, fades and ready-made soundpacks. - PDF Library: PDFs kept inside the world, opened in tabs and shareable with players. /images/general-media/1791564292_BnuuXJTS.webp Characters - Full 5e rules: Species, class, subclass, background and feats fold into one sheet. Each sense, resistance, proficiency, trait and always-prepared spell shows where it came from. Also covers multiclassing, spell slots, class resources (Rage, Bardic Inspiration, sorcery points…), weapon mastery, and short and long rests. - Character Builder: Pick species, class, subclass, background, ability scores, skills, starting equipment and feats from the SRD and any installed pack. - Level-Up: HP, proficiency bonus and hit dice update automatically. ASIs, feats, subclass and spell picks wait as pending choices. /images/general-media/1791564330_JBRRDNZ4.webp Playing Online - Online worlds: Put a world, package or character online and it stays the same on every device you sign in on. Players see the pictures even when the DM is offline. - Players: Join with an invite code, claim a character, move your own token on your turn, and send dice rolls to the DM's log. Shared cards update when the DM edits them. - .dmtz files: Export a world, package or character to one file and import it anywhere. No account or network needed. Content - SRD 5.2.1: Built in and works offline. - 19 one-tap packs: Tome of Beasts (1–3, 2023), Creature Codex, Monstrous Menagerie, Black Flag SRD, Deep Magic, Tome of Heroes, Vault of Magic, Tal'Dorei and more. - Ready-made worlds: 99 Devils of Uzrah's Palace (Shadowdark), Army of the Damned, The Cold Bounty, and soon our own campaign Aegis Act . - Marketplace: Publish worlds, templates, packages and characters as versioned snapshots with content previews. - Social: Profiles, follows, an activity feed, direct and group chats, and game listings with applications.

Trails Weaver is a visual worldbuilding app for game masters, worldbuilders and writers. Every character, location, faction and item is a page with rich text, images, custom properties and a relations table, and any page can also be dropped onto a board. There are four board types: - an infinite free board where element cards nest inside other element cards. - map boards with pins, regions and roads that reveal more detail as you zoom in. - hierarchy boards for family trees and chains of command. - relationship graph that assembles itself from the relations recorded on each page Anything marked secret stays hidden when a world is shared through a read-only public link. The free plan covers one world, unlimited free-boards and up to 25 world elements. Pro removes every limit.

Codex Cryptica is an AI-assisted worldbuilding and campaign management tool built around a living knowledge graph instead of a folder of loose documents. Every character, faction, location, and event you create becomes a linked entity, so your world stays connected and explorable as it grows. Genre-agnostic across fantasy, sci-fi, cyberpunk, horror, post-apocalyptic, western, steampunk, and more.

The Wildsea: Recipes for Disaster / One-Armed Scissor A ragtag crew aboard a restaurant ship sails the endless treetop sea in search of rare recipes and the overdue library ship, the One-Armed Scissor. What begins as a culinary expedition soon turns into a dangerous voyage through the shifting Wildsea as they uncover what happened to the missing vessel.

Dune: Adventures in the Imperium is a tabletop roleplaying game of political intrigue, feudal warfare, and desert survival set in Frank Herbert's Dune universe, published by Modiphius Entertainment with lead designer Nathan Dowdell heading a large credited design team. It released in 2021, timed alongside Denis Villeneuve's Dune film, running on a version of Modiphius's house 2d20 System adapted specifically for the setting's politics-first, duel-heavy tone. The system is a setting-specific adaptation of Modiphius's 2d20 System, the same engine family behind Star Trek Adventures and Fallout: The Roleplaying Game. Description Players build elite agents in service to a noble House - Mentats, Swordmasters, Bene Gesserit Sisters, Spies, devious Advisors, or Fremen of the deep desert - and, before a single character is even built, the whole table designs that House together in a dedicated House-creation mini-game, deliberately keeping play away from the canon Houses Atreides or Harkonnen.  The Game Master runs missions where combat is only one of several ways a scene can go wrong: duels, skirmishes, open warfare, espionage, and courtly intrigue all resolve through the same underlying system, and a table can just as easily spend a session at a negotiating table as on a battlefield. The game leans hard into its source material's core promise - that plans, loyalty, and leverage usually matter more than a blade - and asks players to think as much about their House's long game as their character's next roll.

One D&D session, three connected screens. Lumen VTT gives game masters and players a shared place to run maps, music, combat, dice, character actions, and table-facing moments without turning the session into admin work. What Lumen VTT is for Lumen is designed for D&D 5e groups that want the structure of a modern VTT while keeping play moving. It focuses on combat flow, animated tabletop feedback, live session tools, music, and fast GM setup. A VTT for active tables The app supports a GM view, player views, and a live table display, so a group can play online or around a real table with a TV. Players can use phones while the GM manages the encounter. Automation where it helps Combat features are built around common 5e tasks such as attack rolls, saves, damage, healing, conditions, initiative, movement, and area effects. The goal is to reduce bookkeeping while keeping decisions visible. What to compare in any virtual tabletop When comparing VTT software, look at how quickly a session starts, how much rules work is automated, whether players need heavy setup, how the map feels during combat, and whether the tool supports your actual table format. Links lumenvtt.com - Official website