You can find a detailed breakdown of the openfaas and openfaas-incubator organisations and projects in the docs.
For an overview see the docs or see a feature comparison between OpenFaaS and OpenFaaS Cloud.
OpenFaaS is a platform for building Serverless Functions and/or deploying existing microservices. Any programming language or binary is supported with a range of templates available to help you get started.
The core services which make up OpenFaaS need to run on a Linux master, but Windows worker nodes can be added to your cluster to run Windows binaries and functions.
Platforms: the x86_64 platform has first class support, with 32-bit arm and 64-bit arm provided on a best-effort basis.
Orchestrators: there is official support for Kubernetes & Docker Swarm with the community providing support for AWS Fargate, Hashicorp Nomad and others.
OpenFaaS Cloud is a multi-user distribution of OpenFaaS with a built-in CI/CD pipeline, OAuth delegation, a dashboard and a git-based workflow with public/private GitHub and self-hosted GitLab.
Platforms: only the x86_64 platform has support.
Orchestrators: there is official support for Kubernetes and for Docker Swarm. Kubernetes has better support for multiple users / tenants than Swarm.
Proposals and feature requests are tracked on Trello and through the GitHub issue tracker of each project in the two organisations.
Please see CONTRIBUTING.md.