Download of ProR 0.9.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Eclipse-rmf-pror-0.9.0-sna.zip is the most frequent filename for this program's installer.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free software for Mac OS X is a product of The Eclipse Foundation. The most popular version among ProR for Mac users is 0.9. Some of the software aliases include "rmf-pror". The program is included in Developer Tools.
From the developer:
ProR is a tool for requirements engineering that supports the ReqIF 1.0.1 Standard natively. It is part of the Eclipse RMF project and is built for extensibility. This app supports the ReqIF standard, a data exchange format for requirements. This allows you to exchange requirements with other tools, like IBM Rational DOORS.
You may want to check out more Mac applications, such as PowerGlot, ChIDE or flex sdk 3, which might be similar to ProR.