Wik: Probably the Simplest Wiki Ever

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Wik is really, really simple. In fact, if there was a competition for the simplest wiki out there, Wik would win it hands down. The entire wiki consists of a single HTML file containing just 160 lines of code, which is an impressive achievement in its own right. Wik is also ridiculously easy to use. There is no separate edit mode, so you can edit pages right away. The wiki doesn't support text formatting, but it does allow you to add external and internal links. All data is saved in the browser's local storage, so you can use Wik offline. Better still, Wik works equally well on desktop and mobile devices. Obviously, Wik is not a drop-in replacement for a fully-fledged wiki engine, but it can come in handy when you need to quickly jot notes without leaving the convenience of the browser.