Maybe https://radicale.org/ could fit the bill, CalDav for as a calendar server and CardDav for contacts. - Source: Hacker News / 11 months ago

I now use CalDAV Synchronizer to sync Outlook to my Radicale CalDAV / CardDAV "server" (a Raspberry Pi), with DAVx running on our phones. Source: about 1 year ago

Setup: 1. Install a CalDev server on my home server (running Debian Linux) using maybe Radicale (https://radicale.org/) 2. Use the Linux version of ProtonMail Bridge on this server to set up IMAP to connect to this CalDev server 3. Configure filters to automatically forward event invites sent to my ProtonMail address to my CalDev server, decrypted by Bridge 4. Configure my CalDev server to use ProtonMail to send... Source: over 1 year ago

Caldav is what you are looking for. The other comments mention implementations of them and I can vouch for radicale pretty barebones but does its job. Source: over 1 year ago

We are thinking of writing a guide to setting up a small Radicale instance. This could be hosted on a raspberry pi, or small NAS or something. Source: over 1 year ago

I have been working on https://quantale.io since a year and half and I personally manage the CI/CD infra as well as the data infrastructure for my startup. Here is my setup: 1. Self-hosted Drone.io instance connected to github(the instance is behind a firewall and can only be accessed via a self-hosted VPN. Github IPs are whitelisted so that auto build/deployment can be initiated via github hooks) I have drone.io... - Source: Hacker News / over 2 years ago

I self-host three VPNs to protect my infrastructure heavy startup https://quantale.io I am a big fan of Pritunl which is opensource and provides network security. I use Pritunl to limit access to servers and web applications for my different teams. For eg: - Only dev team can access ssh port(22) on stage server and not open to internet. - Source: Hacker News / over 2 years ago

I have seen a lot of Redditors talk about the recent quarterly earning reports of $AMC and we did find this on quantale.io . Source: almost 3 years ago

In anticipation of the release of Q2 results, the social activity for ETSY was buzzing as could be seen on the Quantale dashboard. The stock price and sentiment both went up on Aug 4, but the stock is corrected today. Source: almost 3 years ago

I got it at the earliest using Quantale, you can try it for free. Source: almost 3 years ago