The table below specifies the more or less concrete short-to-mid-term plans.
Needless to say, all these plans are heavily subject to change.

Linux:
At the moment no application has a Linux edition.
However, the only remaining stumbling-block is the lack of low-level MIDI I/O handling.
Once this is implemented, creating Linux editions should be easy, particularly for the four applications already having macOS editions, since the source code of these macOS editions can be used for Linux almost verbatim.

macOS:
Four applications are available in editions for Intel-based macOS. However, due to lack of funding and time these applications will not be ported to the upcoming ARM-based ("Silicon") versions of macOS, so you'll have to use Rosetta 2 to run the Intel-based editions on ARM-based machines.

Windows:
Nearly all applications are available on Windows as dual 32/64-bit installers (which automatically install the edition matching the operating system) and as 32- and 64-bit portable editions.
The exception is the Delta Framework application, which will remain available only as a 32-bit installer until further notice.
The Delta Framework application is behind the times in several other respects as well, such as:

• MIDI I/O handling.
• It is 'pre-mountainutilities.eu', thus links to the old Mountain Utilities web site.
• It doesn't provide advanced setup/desktop management yet.

The table below specifies the availability of manuals, Intel-based macOS editions and Linux editions: