Harbour 2.0 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application is included in Developer Tools. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac app is a product of Harbour Project.
From the developer:
Harbour is the open/free software implementation of a cross-platform, multi-threading, object-oriented, scriptable programming language, backwards compatible with xBase languages. Harbour consists of a compiler and runtime libraries with multiple UI, database and I/O backends, its own build system and a collection of libraries and bindings for popular APIs.
You may want to check out more software for Mac, such as Real Golf 2011 or The Provinces Of Midland - Argskin, which might be related to Harbour.