Open source alternatives to popular SaaS products
Some time ago there was a tweet making the rounds with a joke along the lines of:"Congrats on your startup's Series A. Now you have enough runway to pay for 6 more months of  - Jira
  - Github
  - Slack
  - Google Office
  - Google Cloud/AWS
  - LaunchDarkly
  - Contentful
  - Tableau
  - Zendesk
  - Salesforce
  - ...
"I started to wonder if there is a market for a startup that simply takes all of the best-in-class open source alternatives and hosts the whole package that is commonly needed by companies. Would anyone here use something like that, and why don't smaller hosting providers invest in something like this? You see a lot of them offering basic Webmail/Calendar, but couldn't they go beyond that and use that as a possible revenue stream to compete with the big cloud providers?