The 3.3 version of openrpt for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program belongs to Developer Tools. The most popular version among openrpt for Mac users is 3.3. This free Mac app is an intellectual property of xTuple.
From the developer:
Graphical SQL report writer, designer and rendering engine, optimized for PostgreSQL. WYSIWYG display, GUI built with Qt, runs on Linux, Windows, Mac OS X. Reports can be saved as XML, either as files or in a database. Download the free program and his open source
You may want to check out more software for Mac, such as Midas, Tulip- or DB-Text, which might be similar to openrpt.