It's an app I coded myself over the better part of 15 years now - it's nothing too exciting, just a LoB app for contract administration with a small but dedicated user base. The version I worked on before the current one was a local-only app. The current version was developed to be client-server. Toyed around with doing a web app all those years ago, but it didn't feel like the web as an app platform was quite there yet. I also had a fair amount of legacy code that was still useful that I didn't want to throw away completely.

Anyway, after focusing so much time and effort on the client-server apps, it is finally time to focus on a web front end (only 10 years or so late!). So I've written a middle-tier (running under Wine) with Nginx in front it. The middle tier translates JSON over HTTP->COM calls, then translates COM->JSON over HTTP on the way back. It's a bit of a Frankenstein's monster, but it works and the approach has meant I can keep a tonne of existing code and keep adding features and improving existing features, which has been nice.