j2k 2.6 for Mac was free to download from our application library. J2k for Mac lies within Audio & Video Tools, more precisely General.
From the developer:
j2k is a free Photoshop and After Effects plug-in set for reading and writing the JPEG 2000 file format, the successor to JPEG.
Also known as JP2, JPEG 2000 uses wavelet compression as opposed to the DCT compression used in standard JPEG. The end result is better image quality in a smaller file. JP2 also includes mandatory metadata such as information about an image's color space.
You may want to check out more software for Mac, such as Convert Image Format, Text On Image or ContentaCR2Converter, which might be similar to j2k.
Document management
Converters