Tiddloid Lite, a lightweight version of Tiddloid, is an app to work with locally stored TiddlyWikis. Once have some ideas, you can immediately write them down and save it in a tiddler, and sync the Wiki to your other devices so that you can access these ideas anywhere.

Can create a new local wiki with the latest template. Can import existing Tiddlywikis.

Github: https://github.com/donmor/Tiddloid/

Firefox addon to save and backup Tiddlywiki. Requires installation of some native host software (https://github.com/ibnishak/Timimi/releases). Seems to work pretty well so far.