I've been impressed with what the Flynn team has gotten done since my time with them at Y Combinator. The cloud hosting and containerization open source world has gotten a lot more complicated and powerful.
What is super interesting about Flynn is that they've captured exactly what made Heroku phenomenally great and made it as simple to run on your own servers. This is a refreshing take that is now battle hardened. It's exactly what the DevOps world needs since all the complexity also makes it that much harder for people to get started and get off the ground.
Flynn
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Y Combinator
Flynn