Is there any Web GUI plugin for viewing Lostash activities!

I have started working on Lostash 2.1. I use to putty to the server and view logstash activities and run or stop config file. Is there any GUI plugin for logstash like we have HEAD in Elasticsearch.

Nope, LS doesn't yet have APIs to be able to read this sort of info.
These are being worked on though, so you will probably see something in the near future.