Mongrails is a project mainly written in GROOVY and JAVA, it's free.
A rest interface for MongoDB written in Grails
Mongrails is a simple rest interface for MongoDB written in grails. This project is developed against grails 1.2.2.
Configuration: Edit the Config.groovy file to specify the location of your mongoDB server. The following parameters can be changed:
mongodb.databaseName="production" // The database that you want to add rows to mongodb.primary.server.address="localhost" // The primary MongoDB server mongodb.primary.server.port=27017 // The primary MongoDB server port mongodb.secondary.server.address="localhost" // Optional: Specify a second MongoDB server if necessary mongodb.secondary.server.port=27018 // Option: Specify a second MongoDB server port