hi prashant,
With the little information that you have provided , i assume you mean to look for Web Host providers who offer to host JSP websites. Tomcat converts JSP into servlets and acts as a web server and is required to host java powered sites. An example of Tomcat Sevice provider is
http://www.oxxus.net/hosting_java.htm .
Tomcat on Wiki
Apart from these two kinds of SP, i cant figure out any.
Naveen