http://en.wikipedia.org/wiki/StartCom

Trustedness In contrast to CAcert.org, which also offers free Class 1 SSL certificates, the StartSSL certificate is included by default in Mozilla Firefox 2.x and higher, in Apple Mac OS X since version 10.5 (Leopard), all Microsoft operating systems since 24 September 2009,[2][3] and Opera since 27 July 2010.[4] Since Google Chrome, Apple Safari and the Internet Explorer use the certificate store of the operating system, all major browsers include support for StartSSL certificates.

https://cert.startcom.org/

Get Your Certificate: