Numble - It's like Wordle for Math equations.
Learney - Knowledge aggregator for developers
Guriddo - Guriddo (グリッド, Japanese for grid) is a free and competitive number puzzle app with daily challenges.
Newton - Newton is a mobile ready, fully-featured applicant tracking system for small and medium-sized employers.
BioBase - Measure and manage your stress
MathCrunch - Learn math stress free