GLMMadaptive

R package GLMMadaptive: Generalized Linear Mixed Models using Adaptive Gaussian Quadrature. Fits generalized linear mixed models for a single grouping factor under maximum likelihood approximating the integrals over the random effects with an adaptive Gaussian quadrature rule; Jose C. Pinheiro and Douglas M. Bates (1995) <doi:10.1080/10618600.1995.10474663>.