TokuMX vs ToroDB: What are the differences?
TokuMX: A high-performance, concurrent, compressing, drop-in replacement engine for MongoDB. TokuMX is a drop-in replacement for MongoDB, and offers 20X performance improvements, 90% reduction in database size, and support for ACID transactions with MVCC. TokuMX has the same binaries, supports the same drivers, data model, and features of MongoDB, because it shares much of its code with MongoDB; ToroDB: Open source, document-oriented, JSON database that runs on top of PostgreSQL. ToroDB is an open source, document-oriented, JSON database that runs on top of PostgreSQL, providing storage and I/O savings and ACID semantics. ToroDB is MongoDB-compatible, so you can use Mongo clients to connect to it.
TokuMX and ToroDB can be categorized as "Databases" tools.
TokuMX and ToroDB are both open source tools. TokuMX with 679 GitHub stars and 90 forks on GitHub appears to be more popular than ToroDB with 10 GitHub stars and 2 GitHub forks.