Ping services via XML-RPC and RPC2

WordPress users know that it is possible to automatically ping search engines (inform a search engine of the updates of the contents of the blog/web site. WordPress uses XML-RPC and RPC2 protocols for this.

I collected a number of ping services that are compatible with WordPress

Beware! If you use this list without looking into details, you risk being identified as a spammer of some of these service for pinging repetitively.