Readline
Readline facilitates command history parsing in python.
brew install readline
JPEG
Jpeg is a library for writing JPEG image files.
brew install jpeg
TIFF
Libtiff is a library for reading and writing TIFF image files.
brew install libtiff
For EMAN2 Developers
If you spend a lot of time developing EMAN2, you will likely want these packages
brew install git cvs doxygen gnu-indent cscope
Excellent documentation for GIT is available at: https://www.atlassian.com/git/