Does anyone use data clustering services on maps?

Question

OpenStreetMap

In one of the projects, due to the rather large number of markers on the map (~300k), it became necessary to cluster them to improve performance on the client side.
From memory, I remembered only two clustering services:

1. Maptimize
   With good performance and advanced features for working with marker properties, but with biting prices.
   
2. Geocubes
   Nina, apparently already closed.
   

Does anyone use similar services in this area, perhaps deployed on their servers? Support for various mapping services is highly desirable: OSM, Google Maps, Bing.

Answer 1

Server clustering is a simple thing. Everything depends on the task.
If filtering and frequent updates are not provided, you can draw tiles and give them to nginx. If filtering is needed, then you will have to filter and cluster on the server + on the client.
Contact.

Answer 2

I rasterize on my server for my own hardware. I use PostGIS + Tirex + Mapnik2 + Mod_tile + Nginx