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Maybe this falls under improvements to existing packages. Feel free to ignore if so.

Simon Walker and I are almost done with a small package to align CCD images of defocused photometry (exoplanet transits observations often involve defocusing). The package also works fine on in focus photometry and is a spin off of the Next Generation Transit Survey autoguiding algorithm, which we developed in 2013. You can see it on github here

The package is building fine on Travis and we're finalising some tests for full coverage. We've used the package template and we are hoping to request affiliated status shortly. I'm also keen to get involved with other areas of astropy. Anywhere where I can be of help. Thanks.