I ride in London, and love https://www.cyclestreets.net/. There are versions for the web, android and now iPhone. It has a 'quietest route' option which I love. Android version gives you voice navigation. I put the phone in my shirt pocket and have it talk me through quiet streets avoiding the hassle of traffic. Open source. Runs on Openstreetmap data. Needs funding and promotion.

[Earlier](https://news.ycombinator.com/item?id=11945254) you mention "good models of processes" and [elsewhere](https://news.ycombinator.com/item?id=11940688) about model building. Which models have been the best for you? Have you read [Robin Milner](http://www.cl.cam.ac.uk/archive/rm135/Bigraphs-draft.pdf)? Do you consider his work to be a good foundation for processes? If not, who do you consider to give a good foundation?

I think this is "still to be done" and "still extremely important"

Ashton Tate made a tree editor called [Framework](http://en.wikipedia.org/wiki/Ashton-Tate#Framework) which I used to write my thesis in the late 80s on a DOS machine. I loved it. It had intuitive keystrokes, using the numeric keypad to zoom in (+) and out (-) of the tree with an easy way to collapse the tree branches (enter).

Each frame held other frames, or could hold text, a spreadsheet or a database.

It wasn’t a DAG (directed acyclic graph) which was frustrating sometimes.

I think you could program leaves to link to other leaves, but I wasn’t any good at programming. It had its own programming language FRED.

The people who grokked it loved it.

I think there is still a [closed source](http://www.framework.com/) community supporting it, last time I looked.

I hope you will use markup with something like YAML or [JSON-LD](http://manu.sporny.org/2014/json-ld-origins-2/) to store your links.

I used to use [Furl](http://en.wikipedia.org/wiki/Furl). I would periodically download their zip archive of my urls, until it became 2GB. I now use [Zotero](http://www.zotero.org/) which takes a snapshot of the url I am on and puts all files into a folder. I realize that this is proactive work: taking snapshot when I find an interesting page, rather than later.