Sharing resource: digital textbooks for Polish schools
Epodręczniki is a site on which you can find digital, interactive textbooks made for Polish schools. There is:
Edukacja wczesnoszkolna - elementary school, for children aged 6-8
Edukacja podstawowa - elementary school, for children 9-12
Edukacja gimnazjalna - junior high school
Edukacja ponadgimnazjalna - high school
I think it may be a good resource for a language learner, especially books in "Edukacja podstawowa" and "Edukacja gimnazjalna". For example, in textbooks for Polish you can find short excerpts of literary texts, in textbooks for natural science you'll find explanations and definitions written in a simple, precise language etc. And the material covered is basic enough that you will not get distracted by looking up strings of difficult words. Pictures should help with that, too.
I know how difficult it is to find reading material appropriate for a beginner - lower intermediate, so I thought I'll share something of the sort in my own native language with my fellow language enthusiasts.