PopFore is a free image masking software, and can be used for the high-quality image masking of various challenge cases, including semi-transparent regions, hair, and shadow etc. Simply using the masking brush, you can get high-quality image masking results with just a few scribble brushes. The extremely fast processing not only enables the easy masking of high-resolution images (>10M pixels), but also provides instant-preview, which makes it extremely efficient in interaction. It can run either standalone or as the plug-in of photoshop.
PopFore is free, but professional and easy to use. It can deal with various challenge image masking tasks (including hair and semi-transparent regions) in an uniform way. It also achieve instant-preview for the first time among existing image masking softwares.