Helpful sites for learning English:

I find some interesting and helpful sites )

1. Listening, Speaking and Pronunciation

First one that i like its   "Tell me more" 

http://www.24english.ru/multimedia/programs-english/380-tell-me-more

This site intenden for russian people .

It has an excellent program for learning English and a lot other information and possibilities like audiobooks,video tutorials,movies in English,tests and much more. 

2.  Reading and Writing

Two sites with fascinating tasks to improve your reading and writing skills,memory)

http://literacynet.org/learningresources/4_networked_indiv/lr_networked_indiv_home.html

http://eslus.com/LESSONS/READING/READ.HTM

3. GRAMMAR

To improve your grammar skills you can do tests on this site-

http://www.ets.org/toeic/bridge

4.VOCABULARY

Useful  sites with talking and Picture dictionaries with CD-ROMs that include pronunciation and sometimes other multimedia support.

https://www.ldoceonline.com/Swimming-topic/

http://pdictionary.com/

I recommend all this sites if you want to improve your skills and if you only start to learn English!)