The ggseas R package is available on CRAN, GitHub and on ggplot2-extensions.
Check out the vignette ggseas - seasonal decomposition on the fly.
Ellis P (2018). ggseas: 'stats' for Seasonal Adjustment on the Fly with 'ggplot2'. R package version 0.5.4, https://CRAN.R-project.org/package=ggseas.