The best replacement for saml 2.0 is 1.1.

The best alternatives to saml 2.0 are rated as following:
★★★★★  1.1
★★★  ws-federation

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Speaking about saml 2.0, one probably shouldn't forget about adfs.

Other search terms related to saml 2.0 and their ratings are:
★★★★★ adfs
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Google Trends

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saml 2.0
1.1
ws-federation