Depending on your view point, I have the lovely task, or not so lovely task or pulling data from 700+ MongoDBs on a linux servers into a SQL Server DB to build some reporting around a specific data point. Using Powershell and the POSH-SSH module I was able to accomplish this. I wasnt able to find much out there for this scenario. Most of what I found was connection to MongoDB on a Windows box. Please read my comments in the script for the explanation of how this works.
Hope you find this useful.