• What is the CoCGMS?

    What is the CoCGMS?

    The CoCGMS or Call of Cthulhu Game Management System is an app developed on the FileMaker platform.  Thousands of businesses and developers create amazing systems using FileMaker.

    The CoCGMS is a game management system intended to give Call of Cthulhu gamers a complete set of tools needed to create both characters and scenarios as well as provide a wide range of other features like catalog tracking, combat utilities, table creation, dice rolling abilities, and much more.

    Scroll through the showcase here to see some of the system features.



  • Character Creation

    Character Creation

    The CoCGMS features a great character generation system allowing you to create templates from which you can quickly roll out dozens of randomized NPCs, Monsters or Player character records; each one having a unique blend of stats, skills weapons and equipment you set the ranges for.  The system is highly customizable to give you the ability make nearly any option just what you want.

    Each character record can have any number of character images assigned to it and built in dice rolling tools let you use a character record interactively to speed up the pace of running a CoC game.

  • Scenario Creation

    Scenario Creation

    Many gaming applications focus only on character creation and dice rolling utilities.  But, there's more to a game than just characters and rolling dice.  There has to be something for the characters to actually do!

    The CoCGMS has a powerful scenario development side which will help you create the other half of a role playing game.  You can store any number of scenarios in the system and have all of your content in one place, ready to reference instantly.

    Write your scenarios just like you would a book with chapters breaks to separate things into chunks.

  • Scenario Tools

    Scenario Tools

    Scenarios can be packed with a huge amount of data such as the actual narrative content of each part, images, character links, dialog, combat groups for rapid fighting resolution and even sound boards.

    Load your scenarios up with sound bytes to play for your players to spice up the flavor of a game or even pre-record dialog spoken by an NPC they might encounter at some point to make sure you get the tone just right.

  • Scenario Parts

    Scenario Parts

    In the CoCGMS, scenarios are built by creating parts of the whole.  This allows the keeper to compartmentalize his or her content into easily found and referenced chunks of information.  Major parts of the scenario are broken down into chapters and within those chapters are parts like events, group references, historical information, etc.  These part types are customizable by the keeper to be just what he or she needs them to be.

    Order your parts in the logical order you need and move sections easily if necessary.  Attach images, notes, dialog, printable items and more to each part.

  • Catalogs Galore

    Catalogs Galore

    Use the CoCGMS to store customized catalogs of anything you may need to reference or assign to characters.  Each package in the system can be loaded with catalogs of melee items, range items, spells, skills, print templates and much more.  Organize things by era or any other logic you see fit to use.

    Nearly all entries can store an image helping you flesh out the feel of all items.  Attach catalogs to packages, scenarios and/or directly to characters themselves to provide a base selection of available items.

  • Table Concatenation

    Table Concatenation

    Give your brain a break!  Let the CoCGMS create unique things for your game but concatenating up to 7 tables of things into truly interesting outcomes.  Leverage features that let you build just the right thing generator.  Build interesting names out of syllable strings, generate new insanities, describe people your PCs meet on the street at the click of a button, and more.

    It's amazing what you can come up with by letting the system string together a few random possibilities.

  • The Players Window

    The Players Window

    The CoCGMS is both a behind the scenes development tool set AND an interactive gaming utility designed to be used as you game.  One of the best interactive features is the Players Window which displays things for the players to see as you game like images, dice roll results, table selections, GM jotted text and more.

    Using a third party utility like "Actual Multiple Monitors" you can mirror the contents of the Players Window to a dedicated monitor facing your players.  Turn off the mirroring of content when you need to or clear the Players Window at will to keep the players from seeing too much!

  • Print It!

    Print It!

    Print characters the way you need to.  Print full character sheets for the players, 3x5 quick reference cards for NPCs, tack sheets of just names and occupations to give to players as help sheets for knowing each other or NPCs, tent cards to stand up in front of players, and more.

    Print out your scenarios to have a paper copy handy or print Print Items attached to scenario parts such as journal entries, found telegrams, doctor's prescription orders, etc.  Install a free PDF print driver like PrimoPDF and send everything to PDFs to keep on your computer outside of the system.

  • Many More Features

    Many More Features

    The system is packed with many more features than covered here in the showcase.  Download a copy and give it a try!  The CoCGMS is completely free.  No nag-ware, no ads, no in-app purchases, no donation requests, no charges at all.  Just free to have fun with.

  • Multiplatform


    The CoCGMS can be installed on Windows, Mac and iOS (iPad) platforms.  For Windows and Mac versions of the app, just download the correct zip file to your system, unzip and run.  No installation needed.  Just run CoCGMSv2.exe (Win) or the CoCGMSv2 app (Mac) and you're off and running.  Make additional folders to hold multiple copies of the app if you'd like.

    For iPads, download FileMaker Go from the app store (free) and then download the raw database file from MPConnection.com and transfer to FileMaker Go on your iPad using iTunes and run the database from within the FM Go app.

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Dark Cults


This is an older FileMaker database I created some years ago as a homage to a classic, simple two-player card game called Dark Cults.  This game is long out of print and I've tried to track down the author to get permission to post it for free but I've been unable to find any way to contact him.  Hopefully this doesn't offend anyone as it's not my intention to infringe on anyone's ownership of this game.  To be clear, this is a game created by Kenneth Rahman and published by Dark House Publishing.  I've simply recreated it as a FileMaker interactive database as a game platform.

Currently this database hasn't been compiled into an executable for Windows or Mac like the CoCGMS has.  This game is intended to be played using FileMaker Go under iOS.  To play it, grab the latest version of FileMaker Go from the App Store and transfer the game to your device using iTunes or some other file client like FileBrowser which lets you access files via a shared folder, cloud storage, FTP, etc. 

Once FileMaker Go has been installed and the database transferred over, launch FM Go and tap to load the database.  Play is done on a single device and each player takes a turn, passing the device when it's the other player's turn.  The game rules are available from the Main Menu and a catalog of all the cards can be viewed to familiarize yourself with the deck.

I apologize but I can't seem to find the original instructions PDF I created to fully explain how to use the interface.  I hope to redo that in the near future.  But basically, click New Game to create a new game.  Multiple games can created and played.  Each game will be resumed from the last play when it's opened or you can return to completed games to see how it played out.

Each player has a key they use to open their hand.  Life's default key is 11 and Death's is 99.  Enter the your key when it's your turn to open your hand.  Close your hand before passing the device to the other player.


Once your hand is open, you'll see your cards and can play as the rules dictate.  Read over the game instructions and hopefully you can work out the interface.  Once you've made your play, End your turn and pass the device to the other player for their turn.  If you don't want to end your turn but the other played would like to review their hand (perhaps for an end of round scenario) you can Close your hand without ending your turn.  Both players always see the storyline as it's been played.


There is a default game in the database that is 13 cards into play.  My buddy Tim and I are frequent players of Dark Cults when we can get together so you'll find our names as the player names.  When we play we like to create a fairly complete narrative to go along with the cards we play so you'll find options in the game for adding a more complete narrative for each card played and a feature to view all plays and the accompanying story told for each.


Please enjoy the game and tell a good story as you do.  Dim the lights, pour yourselves a good drink of your choice and have fun.  Feel free to contact me if you have any questions about the game.

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