Two years ago (two years and one day if you're being picky), I posted a pointer to a Spanish language web site hosted by Francisco Yuraszeck (professor at the Universidad Técnica Federico Santa María in Viña del Mar, Chile). The site, Gestión de Operaciones, is listed in the resources box on the right. Recently, Francisco informed me that he now has a companion English language site, Linear Programming (LP) and Operations Research (OR) Exercises and Resources for Students. He asked for help getting the word out about it, and I'm happy to do so.
For readers active in the OR community (and in social media), please have a look and, if you like what you see, help publicize the site.