We all have our favorite apps. I have mine like everyone else and here are a few that work well in conjunction with the CoCGMS...
Actual Multiple Monitors
AMM is a great Windows utility by www.actualtools.com and gives you enhanced controls over the monitors attached to your system. If you're like me you have at least two and possibility three monitors attached to your workstation. AMM lets you do things like define grids on your monitors you can use to drop app windows into and have them automatically resized. It's best feature for use with the CoCGMS is window mirroring. AMM can be used to mirror the contents of an app window or even an app child window to a dedicated monitor. Using this feature you can mirror the CoCGMS's Player Window to a dedicated monitor which is facing the players and show them output generated by the system like images, dice rolls, table selections, GM posted text and more.
Honeyview for Windows by www.bandisoft.com/honeyview is a highly customizable image viewer. Along side of outputing images in the CoCGMS to the Players Window, you can also opt to output image to an external viewer. Honeyview can be customized to remove all toolbars and screen elements to give a clean display to players.
SimpleDiagrams from www.simplediagrams.com is a versitile and easy to use diagramming app that can do anything from folksy flow charts to basic landscape designs and everything in between. It lets you create your own object libraries from JPG, PNG and SVG files and add them to your diagram with ease. You can scale your obects up or down and layer them as needed. Makes a handy mapping tool for basic encounters or simple topography maps with some creativity.
I can't forget giving a spiel about FileMaker Pro (www.filemaker.com). As you know, the CoCGMSv2 is a FileMaker database. FileMaker is an award winning database system which has been used over the years by thousands of companies and users all over the globe. Unlike SQL, FileMaker is schema, data and presentation all in one package. Design your interface and store your data in the same engine. Happy as a workgroup app or scalable for hundreds of concurrent users, FileMaker can be a client/server application or a stand alone developer package. FM16 was just released on 5/9/2017.
This freeware utility allows you to view the display of any monitor attached to your system in a stand-alone app window. This is very useful with the CoCGMS if you are displaying the Players Windows on it's own monitor that faces your players but want to be able to see it too. Launch this app and select the monitor to view and it's displayed in an app window. You can then mouse over to the Players Window monitor and still see your mouse pointer allowing you to interact with that display and still see where your pointer is.
ZoomIt is a classic SysInternals utility for drawing on your screen. It's free and has been around for years. It still works great under Windows 10. You can use it in combination with Multiple-Monitor Viewer (above) if you are using the Players Window and draw on the display the players can see. Face the Players Window monitor to the players and launch Multiple-Monitor Viewer so you can see what they see. Then, use ZoomIt to draw on that display while viewing it in the app window showing that monitor.
DuetDislay (www.duetdisplay.com) is an incredible utility that lets you link your iPad to a PC or Mac as a 2nd display via a usb cable (the best responsiveness level is always hard wired). This can be used as the Players Window for the CoCGMS and gives you a very portable player facing display for showing game content to the players. Upgrade to DuetDisplay Pro to gain some high end drawing functionality to your main system. I like to use it with my Windows 10 system and SimpleDiagrams. I link my iPad Pro up to my laptop as a new display then place SimpleDiagrams on it. The Wacom level Apple Pencil sensitivity works perfected for drawing in SimpleDiagrams. Obviously there are some nice drawing apps natively for iOS but having the ability to use high resolution drawing tablet features on a full graphics app on a Windows (or Mac) machine is hard to beat.
FileBrowser (https://www.stratospherix.com/products/filebrowser) is an iOS app ($) that lets you browse network resources and transfer files back and forth between an iPad or iPhone and a Windows or Mac PC. This is useful in transferring the CoCGMSv2.fmp12 database file from your workstation to your tablet without needing iTunes and a physical USB connection between devices. Once in the FileBrowser file store, you can send a copy of the CoCGMSv2.fmp12 file to the FileMaker Go app. You can also share a file within FileMaker Go back to FielBrowser then use FileBrowser to upload it back to a workstation. When iOS 11 comes out and more flexible inter-app file sharing is available, transferring directly to & from FileMaker Go should be greatly enhanced.
FileMaker Go can natively access content saved to iCloud. You can place a copy of the CoCGMSv2.fmp12 database file onn your iCloud drive and pull it down inside of FileMaker Go. You can then upload your edited CoCGMS back to iCloud from where it will be accessible to your Windows or Mac workstation.