<blockquote>1. If I create template on T3 Framework 2 for my site I don’t need to put T3 links in footer of my site?</blockquote>
>> Yes, thats correct.
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2. The same question but in case that I want sell somebody templates maked on T3…</blockquote>
Yes, if you are using T3 framework for commecial reselling, then you are requested to follow the copyright guidelines as mentioned in the wiki page here >> http://wiki.joomlart.com/wiki/JA_T3_Framework_2/Copyright
<blockquote>3. I need to put on my website and websites of my clients any joomlart.com links?</blockquote>
No. That would not be necessary.