Freeman (1978) suggested that there were 6 strategies based on the speed and timing of entry of firms into new business areas (the first 4 being tech focused):

Offensive
Aim for technology and Market leadership. For example Dropbox or RackSpace.

Defensive
Behind offensive firm in market, can learn from their mistakes or take different parts of the market. For example Nook following the Kindle.

Imitative
Behind tech leaders, takes advantage of licensing, geography and costs. For example Reuters new business providing farmers with crop price information via text.

Dependent
Satellite to other firms, highly dependent on customer for technology. Such as game/aps developers for Facebook/iPhone (e.g. Zynga).

Traditional
Little if any tech involved, changes only due to fashion, often hand made. For example traditional pottery like Paul Jessop.

Opportunist
Realises new niche opportunity, but not based on R&D or tech, just something no-one has thought of before. For example Snuggie Blankets (basically a blanket with arms)