In fact, there are hundreds of such dictionaries. But there are not many of them in electronic form. You can use Wiktionary because this dictionary is based on serious scientific dictionaries.

The most famous etymological dictionary that you can find on the Internet in electronic form is the dictionary 'Макс Фасмер. Этимологический словарь русского языка'. There's also an iPad app 'Dict А-Я для iPad. Russian Dictionary. Толковый словарь'.

The book "Roots of the Russian language" is the only etymological book I have found. https://books.google.com.au/books/about/Roots_of_the_Russian_Language.html?id=DZxoQgAACAAJ&redir_esc=y

Sometimes available for free, but I've lost the link for now.