Thank you for the heads up Skywatcher.

Gtasks is hardly what I would call a serious outliner tool.

The fact that it is Apple, 400mb and appears to be more of a Word Processor is a showstopper. No doubt it comes at a price?

I have used B-Folders for many years. (jointlogic.com). It is multi-platform, but the best thing about it, is the syncing tool, which is non-cloud, and connects via local IP address. I'm not a fan of ...

Nuclino is very good and ticks many boxes. However there is no mobile client for Android and iOS, which makes it a showstopper for me I use Redbooth for project management, but it can also be used...