An amazing resource from Fredrico Boschetti. Visit his site here: http://www.himeros.eu/
A powerful tool for researching Koine usage.
Higher end versions contain the Morphological Tool, an amazing way to do quick corpus analysis.
This is an excellent parsing tool for Classical Greek. It is offline and Java based. It can digitally print paradigms to Excel or other formats. It was invaluable for me in my first years of teaching via communicative methods for checking forms.
No longer under development, but available from HERE with permission from author, Gonzalo Diaz.