Gigasoft was a German software house who wrote and published several software titles, including:
EASE - A QL front end with a similar look to GEM
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GigaBASIC - A sprite and window / menu control toolkit
GigaChrome - A screen editor with icon controlled commands
Pengi - A good addictive game where you have to push blocks of ice to kill the enemies trying to eat you
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Gigasoft were one of the first mice (the Giga Soft Mouse) and an interface to allow you to use PC style Keyboards with the QL, as well as the GigaSoft MegaRAM board.