Top 3 JavaScript tbsync Projects

EAS-4-TbSync

1 180 5.9 JavaScript

[Thunderbird Add-On] The Exchange ActiveSync provider for TbSync to sync contacts, tasks and calendars to Thunderbird.

Project mention: Our Fastest, Most Beautiful Release Ever: Thunderbird 115 “Supernova” Is Here | news.ycombinator.com | 2023-07-12

What I mean is that if you have an Outlook account, and you want to use Thunderbird for it, you will need to sync your Outlook calendar with Thunderbird. Outlook uses Exchange ActiveSync instead of CalDav/CardDav for this syncing.
The way to give Thunderbird these capabilities are by installing these two connected addons [1, 2]. At least till June 2022, I could see meeting invites from colleagues in Thunderbird. I would also see the translucent event in the calendar in Thunderbird. But accepting the invite would not work [2]. Also creating and sending Outlook calendar events from within Thunderbird didn't work. So, I always had to open the web Calendar to do these things. Thunderbird was only good for meeting reminders.
There is a new major release of the addon since then, so it is possible that the bug is fixed.
> I apparently don't get event invites from Outlook Calendars then
Obviously if your email/calendar account is something else, then you have no problem. If someone sends an invite to my gmail, from their outlook, I can accept it fine from within Thunderbird, because Thunderbird/gmail are communicating using Caldav (I think).
> Which clients do work with that then, only Outlook itself?
I will use Thunderbird as much as possible till it is pried from my cold dead hands!
[1] https://github.com/jobisoft/TbSync/
[2] https://github.com/jobisoft/EAS-4-TbSync/wiki/About:-Provide...

DAV-4-TbSync

2 163 4.7 JavaScript

[Thunderbird Add-On] The CalDAV & CardDAV provider for TbSync to sync contacts, tasks and calendars to Thunderbird.
SurveyJS

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Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Google-4-TbSync

1 50 3.5 JavaScript

This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).