[MetricMike]

http://superuser.com/questions/135719/windows-program-to-lim...

NetLimiter (free) and NetBalancer (paid, free for 5 processes) have been the go-to solutions for Windows for a little while.

IceFloor (http://www.hanynet.com/icefloor/index.html) is the OSX (10.7+) analog.

[adrinavarro]

Sadly IceFloor doesn't seem to have an option to quickly filter out in a per-program basis. And Little Snitch, well…maybe a bit overpriced if it's just to block Spotify (hell, they should be the ones providing a setting for that).

[j_s]

Found this on its page, though I don't have the chance to check it out:

  > monitor applications connections , block outbound connections
  > to unwanted services (block chat, p2p...)

[j_s]

http://superuser.com/questions/474255/is-there-a-free-local-...

also lists http://bandwidthcontroller.com/trafficShaperXp.html