Operating Systems · HQ: United Kingdom · 1,000 to 5,000 employees
Canonical is the company behind Ubuntu, a Linux distribution. They provide commercial support and services for Ubuntu and develop enterprise open source solutions.
Operating Systems · HQ: United States
Linux Foundation is an organization focused on developing open-source software, building communities and companies around the Open Source Software idea.
Serverless Framework 
Node.js 
Golang 
Python 
Operating Systems · HQ: Germany
SUSE develops its main product, SUSE Linux, an open-source enterprise Linux distribution.
Python 
Django 
C Golang 
DevOps · HQ: United States
CAST AI is a Kubernetes automation platform using ML to cut cloud costs through automated rightsizing, bin packing and Spot Instance orchestration. It works on AWS, GCP and Azure.
Golang Python 
DevOps · HQ: United States
vCluster Labs (formerly Loft Labs, renamed in August 2025) is a remote-first company in San Francisco with a global team. It created vCluster for virtual Kubernetes clusters. Its open-source projects include DevPod, jsPolicy and kiosk. It works on platform engineering for multi-tenancy and efficiency.
Golang Python 
Kubernetes
Linux