A new version of Nekolauncher was released yesterday. Nekolauncher is a launcher for
openMSX, like Catapult is for Windows, but then for Mac OS X. This new version has a lot of small fixes and many new features, too many to mention them all. At the moment it looks like it supports almost all features from openMSX, including a number of newer features that can -for the moment- only be found in the 'dev' versions (which you can obtain by
compiling the source code).
Relevant link:
Nekocan