Arabic graded reading — curated sources

Al Jazeera Learning Arabic (A1–C2) · Al Jazeera: free, seven proficiency levels, news-based MSA with multimedia.
Arabic.ba (A1–B1) · Free graded reading from the Al-Arabiyyah lil-Nāshiʾīn series.
Lingua.com Arabic (A1–C1) · Graded MSA texts with comprehension and PDFs (freemium).
Hindawi (B1–C2) · 3,000+ free public-domain Arabic books: literature and translated classics.
Kalila wa Dimna (B2–C2) · Classic Arabic fables (public domain).