GM Assistant

DiceCalc is a TTRPG dice managmeent system for players and GMs. Here's what it does: Roll all of a character's dice simultaneously — see every attack, save, skill, and modifier roll all at once via the Roll All mode with character tabs. Still reroll per macro — long-press any single roll to edit or reroll just that macro without rerolling the rest, even in Roll All mode. In-depth macro inspection — Roll Macro mode focuses on macro options, allowing players to inspect rolls, rename, edit, and sort the macro list. Sort order here is also preserved in Roll All mode. Cryptographically secure random number generation — higher unpredictability, more randomer. Sortable character tabs with up to 100 macros each — whether you're running or playing a campaign, organize by character, encounter, monster, game system, or any other way you like. Every major TTRPG dice mechanic in one app — keep high/low, target numbers (successes), botches, exploding dice, crit detection, multi-roll comma separation for staged (verification) rolls, and yes... push dice! Constraint validation with red-highlighted error feedback — pathological expressions are caught before they run, no infinite loops or broken math. Persistent 300-roll history with timestamps — every roll logged with full roll breakdown and no truncation. Tap-and-hold context menus throughout — edit, duplicate, delete, rename, reroll wherever it makes sense. Localized in 7 languages — English, Spanish, Portuguese, German, French, Italian, Polish, with complete in-app manuals for each. 14-page in-app user manual — every feature documented with examples, no need to leave the app. Supports Android 8.0 and above — runs on devices going back a decade. Custom QWERTY keyboard for macro names — with locale-specific diacritics via long-press. Independent horizontal scroll per output row — nerd out inspecting long expressions, results, and roll details without truncation. Also... I'm giving it away for free till 09/31/2026 11:59:59 (JST). Check the promo section of the website for details. Honest reviews are appreciated.

VVD is a visually driven world-building and campaign management platform launched in 2024. Created by an independent developer, it positions itself as a streamlined, "distraction-free" alternative to complex wikis like World Anvil. In 2025, the platform gained massive popularity on social media for its "clean UI" and its strict No-AI pledge, promising that all art and assets on the platform are created by human artists.  Description VVD is built for the "sparks of inspiration." It uses a card-based system to organize NPCs, locations, and magic items, allowing users to connect them visually through an interactive graph. Unlike traditional folder-heavy organizers, VVD feels like a digital corkboard or a personalized Wikipedia that prioritizes aesthetics and ease of use. It is a web-based tool, meaning it requires an internet connection, but it is highly optimized for mobile devices, making it a favorite for GMs who need to jot down world-building notes on the go.

Item Forge is a small free tool to help GMs to create printable item cards for their table. It is optimized for D&D and Shadowdark. You can quickly fill out the form and it will generate a nice card design. There are predefined templates in D&D, Shadowdark and printer friendly style. You can also use the custom template where you can design it with CSS yourself. There are various export options, from PDF to images and a backup as json. For quick sharing there is a publish option which gets you a link that you can share with other GMs. Item Forge is translated into 10 languages currently and keeps growing.

Margo is a browser-based AI brainstorming tool for original characters, backstories, personalities and short story ideas. For tabletop players and GMs, it can help explore possible histories, motives, relationships and scene starting points for original RPG characters and NPCs. A user supplies a character or premise and chooses the kind of idea to explore. The resulting directions are material to select, revise and adapt to the table's setting. Its backstory and personality tools can support character preparation when a player has a rough concept but wants alternatives for how that person became who they are or might react under pressure. Margo also serves fandom and original-fiction writers. Generated suggestions need human review for consistency, accuracy and suitability, especially when using an established setting. It does not verify game rules or canon, and it is not a virtual tabletop or character-sheet system. The product offers a one-time signup allowance of 50 Sparks, valid for 7 days. Continued use is available through paid monthly plans or one-time Spark packs. Current prices and conditions are on its pricing page.

The Roost is a group of friends who stream D&D actual play through of campaigns along with How to Play tutorials!  Let the good dice roll! Cast: Joanna as Dungeon Master Miles as Vronin Snapfuse John as Talon Harbinger Jackson as Varek Jowl Austin as Kai Baltoris David as Viken Kasholt

Modern AGE is a genre-toolkit tabletop roleplaying game covering everything from the Industrial Revolution to the near future, published by Green Ronin Publishing in 2018 and designed by a team credited as Matthew Dawkins, Meghan Fitzgerald, Sian Ingham, Steve Kenson, Alejandro Melchor, Chris Pramas, and Malcolm Sheppard. Rather than shipping with a fixed setting, it hands a table the rules to build gritty two-fisted action, pulp adventure, urban fantasy, or a dystopian near-future campaign from the same core book. The system is built on the Adventure Game Engine (AGE), the same engine Green Ronin uses for Dragon Age, Fantasy AGE, and Blue Rose, built here as a fully classless implementation rather than the class-based approach those other lines use. Description Characters are built from backgrounds and life experience rather than a class list, advancing across 20 levels while a table decides for itself what kind of modern-ish game they're actually playing - a two-fisted pulp game, a grounded action thriller, an urban fantasy campaign with magic running underneath the modern world, or something further out toward science fiction.  The Game Master leans on the same optional Arcane and Psychic Power rules whether they're running secret agents, monster hunters, or conspiracy investigators, turning them on only for the campaigns that need them. It's built to be picked up by a group who already knows roughly what modern-day game they want to run and just needs a flexible, classless chassis to build it on, rather than a game with a setting of its own to sell.