Pervasive PSQL is an ACID-compliant DBMS developed by Actian Corporation.
Actian Zen Embedded Database is a hybrid-NoSQL/relational database for superfast transactions and standard SQL access.
Actian Zen offers full security, encryption, management and monitoring tools, plus a host of other features.
Actian Zen Embedded database is built for environments where users don’t have the resources to manage a database.
Actian Zen enables ISVs to take advantage of new hardware architecture, OS platforms, and computing environments (64-bit, multi-core, VM, Cloud) without application changes.
Official product documenation can be found here.
Actian forum for Actian Zen can be found here.