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Honeypots can be really simple. For example: http://devgrow.com/simple-php-honey-pot/
Other than that, another simple technique to add is to rename your visible fields. E.g. call your emailfield phonenumber and visa versa. Robots are stupid, they will fill out an email in the phonenumber field and visa versa. If you check both of them strict, most robots would already fail.
One other simple technique is to check the browser of the visitor. If it isn’t a real browser, you won’t show a form but other contact information like a phonenumber instead. You have to keep the browserlist (not versions but engines) up-to-date though.