The best replacement for tfs 2013 is git.

The best alternatives to tfs 2013 are rated as following:
★★★★★  git
★★★  teamcity

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Speaking about tfs 2013, one probably shouldn't forget about visual studio 2010.

Other search terms related to tfs 2013 and their ratings are:
★★★★★ visual studio 2010
★★ visual studio 2008
★ vs2012
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tfs 2013
git
teamcity