Ask HN: If not mongo then what?

Hi,

What other open source product can offer following?

- document oriented - makes easier to abstract it as a relation when needed(yes, I know no joins... buy a helmet)

- dynamic fields - a more agile pace of development (good bye database migrations, patches)

- indexed arrays - "tags" and "attributes" functionality

- geospacing

- store binary files (GridFS) - replicate, backup easier binary files

- aggregation framework - analytics

- simple and eazy replication - easier to scale ???

- ttl - handy for caching

Just saying...