Ulam Quarterly Journal Science, Math, Publications, Journals - Ulam Quarterly Journal. Full text, free. http://www.ulam.usm.edu/
Journal of Automata, Languages and Combinatorics Science, Math, Publications, Journals - Journal of Automata, Languages and Combinatorics. Formerly Journal of Information Processing and Cybernetics. https://jalc.de/
Forum Geometricorum Science, Math, Publications, Journals - Forum Geometricorum. Free access electronic journal. http://forumgeom.fau.edu/
Journal of Experimental Algorithmics Science, Math, Publications, Journals - Journal of Experimental Algorithmics. Contents, abstracts, bibliographies. https://www.jea.acm.org/
Nexus Network Journal: Architecture and Mathematics Online Science, Math, Publications, Journals - Nexus Network Journal. Architecture and Mathematics On-line. http://nexusjournal.com/