The best replacement for icecast is shoutcast.

The best alternatives to icecast are rated as following:

★★★★★	shoutcast
★	wowza

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Speaking about icecast, one probably shouldn't forget about mpd.

Other search terms related to icecast and their ratings are:

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Scale is based on the average worldwide traffic of icecast in all years. Click on graph for more.

icecast

shoutcast

wowza