Dear R users, happy to announce that the first version of ompr is on CRAN now (https://cran.r-project.org/web/packages/ompr/). The package lets you model mixed integer linear programs algebraically directly in R. There is also another package ompr.roi that can be used to solve ompr models with ROI. Source code and extended examples are on GitHub: https://github.com/dirkschumacher/ompr While testing the package I also wrote a couple of vignettes describing how to solve various combinatorial problems: https://dirkschumacher.github.io/ompr/articles/index.html Any feedback is most welcome! Best Dirk