Is there a website to find waypoint ID's from coordinate values?
I am looking for waypoints in the Indian ocean area.
One possible source is Skyvector
You can use it like a paper map using the Latitude and Longitude markings to find waypoints (or other positions).
E.g. What waypoints and routes are near S30°0.00' E112°00.00'
Hints: Click "World Hi", use your mouse's scroll-wheel to zoom, play with "Layers".
There are also sites with lists, by region, of waypoints with coordinates. One example is fallingrain