Builders
All builders needs the environment variables CLOUDSMITH_API_KEY, GIT_REPO and GIT_KEY_PASSWORD.
In some cases (usually not) also the variables CLOUDSMITH_UNSTABLE_REPO, CLOUDSMITH_BETA_REPO and CLOUDSMITH_STABLE_REPO are also needed
These variables are documented in the Builder Environment Page.
The following free opensource accounts/services are supported:
A virtual machine for making Windows OS plugin builds
CircleCI hosts virtual machines which produce installers for a number of OS
A similar machine for the creation of installers for the Raspbian ARMHF system.