Easier, so as not to drown in the code. Interested in Java, C, Python. If with GUI, GTK + is preferable.

Closed due to the fact that the question is too general a participant Nicolas Chabanovsky ♦ Jun 25 '15 at 20:05 .

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    Quite a bit of. For example, in Python: Gajim (xmpp-client on GTK +), JabbIM (xmpp-client on Qt), Ubuntu Software Center (For Linux, GTK +), ubuntu-tweak, bleachbit, the list goes on and on.