EditMoin
By way of edittwiki, discovered EditMoin.
This is driven from the command line:
editmoin https://moin.conectiva.com.br/EditMoin
When navigating a wiki, I use the mouse a lot. Switching to a shell window to type a command (with a URL copy-paste action thrown in) isn't lazy enough for me.
How about integrating EditMoin with ExternalEditor's "pencil" icon? Cheapest approach: use a new MIME type x/application-edit-moin, which content is simply the URL, so that EditMoin does not need to be reworked much.
Compare and contrast this with ExternalEditor: its x/application-[zope|moin]-edit MIME type transmits the entire wiki page, which gets passed to a local helper application. The helper application invokes your favourite editor with the wiki content, waits until you're done editing, then updates the wiki.
Let's take this one step further: Name the MIME type x/application-wiki-edit and create a protocol for it. The helper application can be programmed into the browser, with a formalised browser-specific API (or UI) to hook up the external editor. Thus protocol/API/UI need to be implemented just once per browser and protocol once per wiki.
Enough wikis and browsers implementing this enhances the wiki experience in a standardised, consistent manner. Happy happy joy joy!