Existing landscape of tools for thought

I'm interested in:

1. What pain point does this tool try to solve?
2. What are its failure modes?
3. What does it do extremely well?
4. What are some choices quotes about it?

WorkFlowy

The latest Tweets from WorkFlowy (@WorkFlowy). WorkFlowy is a better way to organize your mind. San Francisco

twitter.com

LiveDocs

LiveDocs is a programmable, self-updating document for futuristic companies

livedocs.io

Ulysses

The latest Tweets from Ulysses (@ulyssesapp). Ulysses for Mac, iPad and iPhone. Write Anything. Anywhere. Apple Design Award 2016, Best of Mac App Store 2015, 2013. App Store / Mac App Store

twitter.com

Almanac

Almanac Almanac is a knowledge base that combines wisdom from tech leaders with your team's own practices. Access to tools, templates, and guides from top startup minds. Technology to build custom knowledge on top of Almanac's base content. Formats that make your information actionable, searchable, fresh.

askalmanac.com

Neat: the Meaningness "hypertext book" has a navigation section at the bottom that describes its place in several overlapping structures.