Which google products come from Google employees' 20% spare-time?

I'm looking for specific product names, such as Gmail, Gmaps, etc.Which google products come from Google employees' 20% spare-time?
There really is only one product that came from the "spare-time" idea. Which is Orkut the social networking product, named after its creator, Google employee Orkut B眉y眉kk枚kten. Sadly the product has been a total flop in the US with only 4 million users.



Other popular products from google weren鈥檛 even built by google but purchased from other companies:



Google maps is actually Keyhole Technology.

Blogger and Picasa were also an acquisition.