You can check out any of these repos easily:
git clone kde:<repository name>
Plasma provides components for multi-device workspaces. Plasma desktop provides has been providing a stable, versatile and modular desktop. Plasma Mobile shares many components and all of its underlying architecture with Plasma desktop, but provides a UI and features necessary and useful on mobile devices. The idea is to provide a base platform, that can be augmented with device-specific modules. On a laptop, one would typically install plasma-workspace and plasma-desktop, while on a mobile device, one would install plasma-workspace and plasma-mobile and friends. None of the repositories conflicts with others, so it's possible to provide a system with UIs for multiple formfactors, and decide at runtime, which UI to offer. You can find the source code tarballs of the stable releases of Plasma on download.kde.org. Git repositories can be browsed on cgit.kde.org.
As Plasma Mobile does not have stable release yet, we advise you to pull the code to create tarballs directly from our git repositories' master branches. Relevant repositiories for Plasma Mobile are:
The following git modules are generally useful on mobile devices and provide touch-friendly functionality.
These additional git modules are useful for smartphones.
In order to build Plasma Mobile, please refer to the build instructions.