I rely on this package to build extensible species distribution models. I highly recommend this to anyone getting their feet in species distribution modelling. 

This is my go-to package when I want to take control of maxent tuning parameters to pick optimal models and partitioning training data spatially. It is also good for building null models.

Most geospatial data sit in this package. I use it a lot to obtain both species occurrence records and climate data both at current and projected future scenarios

Functions in this package allow me to handle most of the vector and spatial data I use in building species distribution models. Awesome replacement for raster package.