I highly recommend Scrivener for any project that has words. It is a great project management tool for taking and organizing notes, research projects, wiki writing, blog writing, journals, college papers, novels, GTD lists, etc. Personally, I think the most useful features cork board, the research folder, tags, and the formatter, but there are many other tools in Scrivener that make managing projects easy, regardless of size.

Scrivener also supports plugins, so 3rd-party companies can make templates and other tools for it. For example, if you like Randy Ingermanson's Snowflake Method of writing, you can get a Scrivener template that uses the Snowflake Method to help structure/outline your writing.

Finally, Literature & Latte is a great company to work with. They are responsive to questions and issues, and seem to really care about their customers.

Personally, I use it for writing essays/research pieces and as part of that I take A LOT of notes, gather up sources and references. Scrivener is pretty brilliant for all of that IMO.

Note taking, probably not as good as Onenote or at least not as flexible. But it lets you keep notes in the same "place" as your work (assuming your work involves writing, of course) which for me personally is hugely beneficial.

For a wiki, I actually think it would work quite well. It gives you a lot of tools to sort and store information, and it plays nicely with storage like Dropbox. Only catch is, you need the software in order to be able to read/edit your wiki.

During college I wrote many essays and half a novella in Scrivener. It fit my style of writing, which is horribly non-linear. My novella required a lot of world-building and I appreciated Scrivener's dedicated section for notes and images relating to each story.

I think my best use of Scrivener was to take notes on taxonomy in biology class, making good use of nested documents. By the end of that class I had a huge chunk of the tree of life filled out. I think something like workflowy would be more apt at this task right now, but it was fantastic at the time. That said, workflowy has terrible support for images.

I use it for daily journaling, writing articles, etc. As well as for writing terrible short stories :)

It is quite a versatile bit of writing software. Stable and I've never lost any data. Lots of features (perhaps too many sometimes) and it is well designed imho. I've only used the Windows version though and from what I've seen the macOS version is a slightly different product (please correct me if I'm wrong).

I actually tried using Scrivener for writing half a novel, then realized that one plain text file per chapter with a plain text editor with a good display settings is all I need.

yeah, I actually use it as a role-playing campaign manager. Each campaign gets a scrivener book, and the various tools for tagging and organizing cards and resources scrivener has are perfect for this use case.