Hello there!
I run a project called CoolJugator which is a verb conjugation service and I have just launched a Modern Greek verb Conjugator at http://cooljugator.com/gr/
I have already added over 700 Modern Greek verbs to it and I plan to keep on adding them as we proceed. My initial goal is to hit 1,000 soon.
CoolJugator tries to put all the most common forms of the verb in an easy-to-read and understandable format so that you can take them and use them right away. I have separated the active and the mediopassive verbs too.
There is an autosuggest feature, so you can try that out. Otherwise, use some of the examples on the index page or just type a verb you like and see if CoolJugator can conjugate it.
It's still a beta version and there might still be some mistakes but I hope to fix them as we go. There is a mistake reporting function on the bottom of the page if you encounter any.
I'd like to hear what you guys think!