1. Mathematical Excalibur
https://www.math.ust.hk/excalibur/
2. MATHEMATICAL MEDLEY
https://sms.math.nus.edu.sg/index.php/category/mathematical-medley-digitized-archive/
3. Mathematical Reflections
https://www.awesomemath.org/mathematical-reflections/current-issue/
4. Crux Mathematicorum
https://cms.math.ca/publications/crux/
5. CMS Notes
https://notes.math.ca/en/issues/
6. Forum Geometricorum (Geometry)
http://forumgeom.fau.edu/index1.html
7. Mathematics Competitions by WFNMC
http://www.wfnmc.org/journal.html
8. Best Geometry problems collection
9. Best Geometry problems collection
10. Japanese Geometry Problems