I'm mostly interested in shared vocabulary between Arabic, Persian and all Turkic varieties, as such, I'm more interested in etymology than anything else.
My main languages/language families of interest are in order:
Ottoman Turkish (probably the most eloquent and versatile language, in my opinion) and by extension but to a significantly lesser degree, Turkish.
Arabic (only Standard Arabic and not the various vulgar dialects which I do not consider to be languages)
Persian (particularly Classical Persian)
Azerbaijani
Of less interest to me are:
Uyghur
Uzbek
North Semitic Languages, particularly Classical Syriac, Biblical Hebrew and Aramaic.