Talk about an ambitious project, this is one of those under the radar programs that has been produced with a ton of care and thought. RPG manager isn't for a specific system, but what it does cater to is the GM/DM whom wants finite control over their world and what is in it. There are 2 distinct programs here; the Campaign Editor and the Game Manager.
The Campaign Editor allows you to create world maps (with hexagonal tiles), local maps (both indoor and outdoor) with a square grid, and then link them to each other either via a hex on the world map, or via an image that you've saved. Don't overlook the capability of the world creator based on your previous experience with Hexagonal software. I've discovered it to be robust, and what makes it nice is how quick and simple you can create a map that is functional and works great. Layers offer ease of use, and each tile can be mirrored/flipped if need be, while there is a random tile placement system that handles multiples of the same type. On top of this is the ability to set encounters/weather for each tile position, while it keeps the DM firmly locked into the creation process.
Next is the various creator buttons. Adding a PC/NPC/Creature is a breeze, and while this software isn't AD&D specific I was able to quickly add in a 2nd Edition Aerial Servant and all his stats in just a few clicks. I like that the program will tell you if you've made an error (like forgetting to include # of attacks) and once its added to the library, when reopened it takes on a different color. Subtle things like this abound with RPG Manager, like when I clicked on my world map and decided to do an encounter table for a specific hex, up pops my Aerial Servant, and when I highlighted him, his image and base stats showed up. Excellent design!
The Game Manager allows you to collate all the data you created in the Campaign Editor, and places it at your fingertips. One thing that shocked me was when I opened up my Isolde world in the Manager was that each hex has its own terrain, vision, and random encounters at the bottom. Move your mouse to a new hex and voila, instant feedback. No more searching for charts covering terrain, vision, encounters etc.
While I can't possibly cover everything this program has in this short review, the included screen shots should help shed some light on the features.
Overall, this software has so many great features and best of all its still under development. The designer has put a ton of effort into this product, and while the first glance may lead you to believe its just another hex mapping program, what is hidden inside is as solid an entry into the DM Tool's field as I've ever encountered. I'll be following this product closely and urge you to do the same. Two thumbs way up!