Few of you might already know Air Manager, a 2D instrument panel building application. Air Manager lets you download instruments (in-app) for free, plus you can create them yourself. Because we let you use your own images, and the code is fully customize-able, you can create whatever instrument you want. Air Manager is multi-platform, so it runs on Mac OSX, Microsoft Windows, Linux, and even on the Raspberry Pi.
I'm not here (only) for a commercial talk. Our current release is only compatible with X-Plane, but now we have added support for FSX and Prepar3D. However, this is still a beta version, and it's not available for download yet. We are looking for a few people who want to do beta testing with our software with FSX and/or Prepar3D, and maybe FS9 if that's possible.
If you're interested, send me a message, and I'll share the beta version with you.
To make it all a bit more visual, I have this Air Manager 1.3 promotional video: