Way more than a couple. Maps was also purchased. So was Android. So was Google Docs (formerly Writely). So was Picasa. So was Adsense (!). Chrome, of course, is derived from WebKit.
Besides Search, the only thing on the list that was clearly organic is Gmail.
Whats the difference if its purchased or not? You could say the same about Apple, or any other company for that matter.
Apple didnt come up with multitouch, FingerWorks did.
Apple bought out LaLa to create iCloud and iTunes Match
Apple bought out Poly9 to work on their own Maps app
Apple bought out Anobit to create flash memory
Apple licenses Siri's entire technology from Nuance
Apple bought out Intrinsity and P.A. Semi to make the A4 and A5 CPU's
Apple bought out Polar Rose to add face recognition to the iPhone
Apple bought out Emagic to create Logic and Garageband
Apple bought out Sillion Grale and Nothing Real to create Final Cut
Apple bought out Spruce Tech and Astarte-DVD to make iDVD
EVERY_SINGLE_LARGE_TECH_COMPANY buys from smaller startups to speed up the process and get the right people onboard.
As for Chrome using Webkit, Google is one of the primary contributors to Webkits development, so much so that they actually work on it MORE than Apple, Nokia, Samsung, RIM or any other of the main developers. Chrome has been a hell of a lot more successful than Safari and have very quickly become the number one browser. In november it surpassed Firefox for goodness sake, thats hardly a failure in any shape or form.
People need to stop deluding themselves, Google has a hell of a lot more successes than people blindly make out.
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Apple support open standards. Why do you think the iOS supports HTML5 and not Adobe's (proprietary) Flash? To use another example, from memory, when iTunes was launched MP3 compatibility was built-in from the start while Microsoft continued pushing WMA and charged extra for the ability to encode/decode MP3.
No offence but the idea that Apple are not supporting open standards is an exaggeration, usually from people that are misinformed about Apple products. I am sure that a lot of the people convinced that Apple are not supporting open standards believe Flash is open standard.
Whilst I agree that Apple support open standards, lets be clear here - they only do it where they need to. iOS is a prime example of closed platform and closed standard. Even down to the locked down use of the dock connector.
Lets also not forget that Apple has just stuck two fingers up at the ebook open standards with iBooks 2.