The best replacement for mongodb is mysql.

The best alternatives to mongodb are rated as following:
★★★★★  mysql
★★★★★  couchdb
★★★★  hadoop
★★★  cassandra
★★★  redis
★★  sql
★★  hbase
★  oracle
★  postgresql
★  couchbase
★  elasticsearch
★  dynamodb
★  mysql performance
★  sql server
★  riak
  mongoose
  ravendb
  neo4j
  sqlite

Your alternative for mongodb is not listed? Suggest!
Speaking about mongodb, one probably shouldn't forget about java.

Other search terms related to mongodb and their ratings are:
★★★★★ java
★★★★ django
★★★★ php
★★★★ rails
★★★ node
★★★ hadoop
★★★ node js
★★ .net
★★ node js tutorial
★★ javascript
★★ ruby
★ hibernate
★ elasticsearch
★ rails 3
★ play framework
mongoose
rails 4
asp.net
You have in mind a companion for mongodb and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of mongodb in all years. Click on graph for more.
mongodb
mysql
couchdb