Yes, in fact there is an alternative to CryptDB. After our libraries pass muster with crypto consultants, my company will be open-sourcing our crypto. We implement Boldyreva's OPE scheme, SSE and a few kinds of format-preserving encryption. We're also looking at expanding our stable of cryptographic algorithms, so in the near future we might implement other OPE and searchable encryption schemes. Unfortunately I can't be more specific right now, as it would be imprudent from a business standpoint. I'll try to remember to edit this question with a link when the announcement is made; it should be by the end of this year.