Ah, my bad. Looks like they are not open source. But you can use them if you are not building a database product (as mentioned in their license). Here the downs

Ah, my bad. Looks like they are not open source. But you can use them if you are not building a database product (as mentioned in their license). Here the downside is we can't have a managed service. (Or maybe we can if we can load the module to a managed service, haven't tried that)