C To Delphi converter
This tool will convert most of your standard C code. .
Download executable here.
It contains a split view, with C on the left and Delphi on the right. The Delphi code gets updated in realtime when you edit the C code. The editors are kept in sync, so you can easily find how a specific piece of code was converted.
You can even run the generated code by pressing F9 (uses DWS)
You can drag/drop multiple C files to the application. It'll find the .h files that belong to it, and convert all to .pas files in the same folder.