The best replacement for client certificate is server certificate.

The best alternatives to client certificate are rated as following:

★★★★★	server certificate
★★★	ca certificate
★	root certificate

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Speaking about client certificate, one probably shouldn't forget about soapui.

Other search terms related to client certificate and their ratings are:

★★★★★	soapui
★★	ssl

You have in mind a companion for client certificate and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of client certificate in all years. Click on graph for more.

client certificate

server certificate

ca certificate