The Jakarta Slide project, a low-level CSM, has released version 2.1 beta 1.

From the (downloaded) release notes:

"This is the first beta release of Slide 2.1. It is compatible to the previous
2.0 release, but adds some new features and fixes some issues. Additionally, it
adds transactions spanning multiple requests and extends WebDAV methods to
control external transactions.

NEW FEATURES
------------

WebDAV Layer:
- External Transaction Support as defined by MS

Core:
- Transaction control much more adhers to JTA spec allowing for transactions spanning more than one request
- Added transient exclusive locks that limit the risk of deadlocks
- Extractors for MS Office

Stores:
- Support for Oracle, DB2 and MySQL 4.1 (additional for 4.0)
- Sequence support for MySQL, Oracle and Postgres added (sequence support completed)
- DASL properties expression factory for RDBMS stores dramatically improves DASL performance.
- JNDI store for users
- New caching modes
- File Store performance improved
- Transient utility stores

Client:

- External Transaction Support as defined by MS
- JCA Connector for Slide
- new Ant tasks
- Full support for BIND, REBIND and UNBIND in the client library.
- http://issues.apache.org/bugzilla/show_bug.cgi?id=27483: Add some little convenience methods.

Misc:
- Projector Framework
- Replaced tx file system, locking, default XAResource implementation, etc. with the versions from commons transaction
- Clustering support

BUGFIXES
--------

WebDAV Layer:
- Misc. fixes improving WebDAV conformance
- Default mode limits concurrent requests and prevents deadlocks
- http://issues.apache.org/bugzilla/show_bug.cgi?id=28894: Logger no longer buffers body of request and response

Core:

Stores:
- For Postgres properties can contain up to 1G length
- Wrong setting of latest version when there were more than 10 versions fixed
- Properties are now long enough to store a significant amount of versions

Client:
- Paths associated with creation of resources now work closer to what one would expect
- http://issues.apache.org/bugzilla/show_bug.cgi?id=30125: MoveMethod and CopyMethod now work correctly when passed absolute URLs.

Misc:

KNOWN ISSUES
------------

WebDAV Layer:
- SEARCH doesn't work with WebdavServlet mapped to a path other than /

Core:
- Performance on large collections still not satisfactory
- Security checking performance still not satisfactory
- Concurrency not satisfactory

Stores:

Client:

Misc:
- Documentation needs to be improved"

Jakarta Slide