Some random thoughts about #TiddlyWiki, which is - in my opinion - a very interesting piece of free and open source software targeted at end-users.

http://tiddlywiki.com/

It's a personal note-taking app which can be stored in a single HTML file (including JavaScript code and content).

The TiddlyWiki file can be saved locally or uploaded to a server, and it can be encrypted end-to-end. Installation on Node.js is possible, too, with slightly different features. 1/

Despite its qualities, #TiddlyWiki is probably going to stay niche for the following reasons:

1.) Many of its features require inserting code (markup) into the text fields.
2.) Many features aren't very well documented.

With regards to 1.), TiddlyWiki isn't very different from MS Word or Excel, in my opinion. They often require macros, and Excel formulas can get quite complicated, too.

However, MS has greater market(ing) power, and documentation tends to be better, too. 2/

Bottom line: Poor usability and complexity are important reasons why free and open source software often doesn't get widely adopted. However, we shouldn't forget that proprietary programs such as MS Excel can have steep learning curves, too. People are just more used to them, and it's easier to get help. 3/

@stefanieschulte I think that you hit exactly the problems with TiddlyWiki. I actually have a website for documentation, but it is rather out of date by now.

Unfortunately the dev team is made up of people like me who can make things but are bad at talking about it.