And Opera, and browser tabs, I believe. And the search box in browsers (from Opera).
Tabbed browsing was present in Windows browsers before Opera. There were a lot of browsers that just embedded IE's Trident engine, and some of them had tabbed browsing. Wikipedia says that the first was NetCaptor in 1997. It does sort of make sense that this happened on Windows, because tabs are a natural variation on MDI.
Well, at least they took it mainstream.
Linux, irc and MySQL.
I forgot SSH, from the list of significant Finnish OSS projects, though I think original SSH by Tatu Ylönen was freeware, not OSS proper.
What's not to like about Linux or IRC or even MySQL?
The back ticks to escape MySQL columns ;) But that doesn't remove the huge thanks for producing reliable OSS at such a level that it's a competitor to Oracle.
You forgot Dovecot.
Buzz sequencer. But that's a niche software product.
Wasnt MySQL Swedish?
There were two founders, one Finnish and the other Swedish.
The original author, Michael Widenius is a Finlandswede (swedish speaking minority in Finland).
He founded the company MySQL AB together with two Swedes in Sweden.
Long cold winter nights gives plenty of time for hacking ...
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Nope, QT is originally from Trolltech[1]. Nokia bought the company back in 2008. Later it was sold again, to Digia.