Well, just like you could use any RHEL5 repo with CentOS 5, any RHEL6 should be compatible with CentOS 6.  If you're looking for names, this can be useful : http://wiki.centos.org/AdditionalResources/Repositories

2011/7/12 Edson - PMSS <edson.amaral@saosebastiao.sp.gov.br>
Which extra repositories can be used with CentOS 6?

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Edson D. Amaral
Pref. Mun. de São Sebastião - SP


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