The best replacement for sccm 2012 is wsus.

The best alternatives to sccm 2012 are rated as following:
★★★★★  wsus
★★★★  altiris
★★★★  zenworks 11
★★★  landesk
★★  bigfix
★  dell kace
★  sccm 2007

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Speaking about sccm 2012, one probably shouldn't forget about mdt.

Other search terms related to sccm 2012 and their ratings are:
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★ wsus
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