Google has taken the '00s concept of open source code bounties to new heights. This summer Google will sponsor, a large number of of open source projects, offering a bounty of 4500$ for up to 200 participating developers - if they complete their designated project.
Projects that take on developers will also receive a smaller sum to help in managing the summer coders.

Maxing out on the developer limit, the project will amount to a 1 mio$ contribution to open source.
The companies that sponsor/employ the important members of the large open source projects probably contribute more money than this - but even if this is mainly good advertising it's still a huge deal for the projects that benefit.