Ask HN: Which open source versions of SaaS products would you like to see?

Don't know why the other comment is dead, but Nextcloud/Owncloud might really be a solution to this.

I run a Nextcloud instance and it supplies me with:

  - Calendar through CalDav
  - Photos through automatic uploading from my Smartphone
  - Drive, obviously, through Desktop and mobile client

All of this could be run on a small managed webhosting with Hetzner (for example), their hosting would also provide you with a domain of your choice and mailboxes, so GMail could be done by that, too.

I know that there are extensions/plugins for Nextcloud which provide something like Keep functionality and there's also some plugin to connect to some hosted Office suite stuff, but I didn't look into that, yet.

So: Give Nextcloud a try.

OwnCloud or NextCloud?

Firebase

A combination of customer support chat (Intercom), customer relationship management / sales (Streak, NetHunt), and customer payments tracking.

So basically, the stack that is needed to handle B2B customers as a startup.

Currently these tools are very isolated, and where integrations exist, they are poor. We have to manage customers in 3 different systems that don't know about each other. When making sales progress on Intercom, it doesn't reflect as conversations in NetHunt.

Open-source would be excellent because Intercom is currently problematic with GDPR and high-security systems that don't like to embed third-party Javascript. The ability to self-host solves that. Most people will still use the hosted service you can offer if reasonably priced.

I hope that https://www.chatwoot.com will do this, but they are currently focused on only the Intercom part.

The services also don't necessarily have to be fully vertically integrated in 1 product as long as they interact well. For example, and add-on to Chatwoot that does the equivalent of Streak/Nethunt, something with good API integration, might also do the trick.

Most of the answers are going to be products that do extensive lock in as a service. So its easy to replace quickbooks with dozens if not hundreds of old or current accounting software but only quickbooks has the integration with seemingly every financial service out there. Another example is Slack, when people ask for a replacement for Slack they don't mean "IRC in a GUI" but they mean chat with maybe a thousand integrations to every other service and product, so no matter how you configure IRC it'll never had a thousand one click integrations.

The next most popular answer will be defining user friendly and capable as being a bug for bug compatible identical clone with the current industry leader, despite the fact that the industry leader changes their app completely every two years as a moving target yet the users don't care at all, and the industry leader is rarely user friendly because they don't need to be once they have lock in. What they mean is the transfer will be visually seamless to end users and they somehow don't think that writing a clone would have any legal repercussions to the author and writing a clone would be significantly cheaper than just writing something original. So despite "MS Office" being a continuously moving target for 30 years there will never be a FOSS replacement for it, because it would be legal and labor impossible to make an exact bug for bug clone of todays current version and then maintain it tomorrow. Despite the fact that Google Workspace makes end users considerably more productive and its easier to use and easier to learn, its not bug for bug compatible with Excel so its worthless.

The next most popular answer after that will be UpdatesAsAService where last year's product is pretty much worthless today and you're paying for this years product to work. See TurboTax, and as much as no one wants to admit it publicly, almost all security software that only protects you tomorrow, if they even get to it that soon, from yesterday's threats.