KallistiOS: How to get it
There are two options for obtaining a copy of KOS for your use.
Option #1 is to download a release archive. These are snapshots made of
the working tree once in a while and have an associated version number in
the same style as Linux kernel releases (e.g. 1.2.1).
Note that there may be long breaks between releases. Version 2.0.0 was
released on May 23, 2013, and the previous version (1.2.0) was released exactly
ten years earlier. The release versions may end up being quite old and don't
always really reflect the current state of KOS well at all. The Git versions of
KOS are generally pretty stable and don't really tend to throw away the old APIs
as the paragraph up above may suggest.
Release archives can be obtained
Option #2 is to follow the source control. This is bleeding edge stuff,
but it's generally recommended anyway because KOS itself is pretty stable.
If you want to follow the devel version (e.g., 2.0.x) then you need
to be on this version. If you make local modifications to your tree then you
probably also want to be on here so you can merge new updates. Note that it's
also possible to follow a branch, for example the 1.2.x branch. This lets you
track the "stable" versions in a simpler way.
KOS is now developed (as of early June 2012) using
Git. For more info on
getting setup with that, go here.