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 the 2020 Roadmap on Trello and through the GitHub issue tracker of each project in the two organisations.
Please see CONTRIBUTING.md.