The store with apps is not available on Linux and neither is a consumer targetted downloadable driver.
There's an SDK that works on Linux. By works I mean it runs. The controller itself is not very good.

The dance needed to avoid an event from propagating is quite occult.

function claimEvent(evt) {
        "use strict";
        if (evt) {
                if (evt.preventDefault) {
                        evt.preventDefault();
                }
                if (evt.stopImmediatePropagation) {
                        evt.stopImmediatePropagation();
                }
                if (evt.stopPropagation) {
                        evt.stopPropagation();
                }
        }
        return false;
}
ontouchstart = function (event) { .......
            return claimEvent(event);
}

You can avoid these delays by overloading the ontouchstart and ontouchend events. These are instant. onclick is not triggered until the mobile browser is certain that you are not inputting a gesture.

Management was involved but did not decide. Don Melton decided to use KHTML:

But I chose the engine we used -- with my teamâ(TM)s and my management chainâ(TM)s support, of course -- ...

That's also why Stallman's solution is ridiculous. When companies are too big to fail, their single-customer suppliers are too vital to fail, regardless of which division they supply. Splitting up a big company doesn't do anything to the risk, but it makes hippies happier.

The suppliers will only fail if the single-customer fails. The single-customer will not have significant problems if one of their suppliers fail. Stallman's suggestion is excellent!: Large companies will pay a percentage of their income as tax. The percentage increases with the global gross income of the company. This will force these companies to have good long term business strategies.

And you have not even mention one.

OpenDocument Format is also a zip container with XML inside.

Gimp is getting some good competition from Krita now. The image editing application that is part of Calligra Suite with a focus on painting is very active with many releases. It has CMYK support, tons of filters and brushes and an active community of artists. And there is a tablet version called Krita Sketch.

MuseScore Player
Partly closed but based on MuseScore from the same people.

EbookDroid Nice PDF reader.

A gaymer is a camper in the closet.

No, I'm not being paid. I work on a similar project: WebODF. I wrote the post so someone (thank you) would ask me what is in it for me and I could plug this project.

Seriously: my experience is that PDF.js works acceptably for most PDFs I threw at it. That included large PDFs with designer layout and scientific papers. Granted, poppler (okular, evince) is still way faster in rendering, but I enjoy PDF.js because it is good enough and I know the work it took to make it and can see the improvements they are making still. Trying to write a desktop type application in the browser makes one appreciate a good one like PDF.js.

The PDF viewer in Firefox, PDF.js is an amazing piece of software. It is written entirely in JavaScript and runs in the same sandbox in which a webpage runs. So it is very safe. The layout accuracy and speed of PDF.js are simply amazing. Text selection happens just like it does in the browser. Some PDF viewers only allow you to draw a rectangle on which to do OCR. PDF.js simply lets you select the glyphs.

This viewer has been available as an add-on for a while already.