On-Target Reports: $200

The oldest and most mature of the reporting solutions. It is a set of encrypted REALbasic classes that you drop in your project. A report designer is also included.

Report Framework: Free

These open-source classes were originally developed by Keith DeLong of RedCort software. They do a good job of abstracting out the hard stuff, but there is not a lot of functionality. It might be useful for some simple reporting, however.

Valentina Reports: $400

Introduced in early 2009, this reporting tool only works the Valentina Database. It includes a very slick report designer.

RSReport: $86

Introduced in late 2008, this reporting tool is a set of encrypted REALbasic classes. It doesn’t include a report designer, so you’ll be creating all your reports in REALbasic code. It has a decent amount of features and is updated regularly, but documentation is only in German.

Einhugur Reports: $200

Included as part of the Einhugur tools suite, but pricing has not yet been finalized as it is still in early alpha stages.

TurboReport: $Price not set

Also still in development stages, but looks to have some nice features.

Update (Jun 5, 2009):

rbrw-core

A REALbasic report writer based on OOFILE.

And lastly, REAL Software announced in their June newsletter that they are working on a reporting component that will be part of the IDE itself.