This volume collects contributions written bydifferent experts in honor of Prof. Jaime Muñoz Masqué. It covers awide variety of research topics, from differential geometry to algebra, butparticularly focuses on the geometric formulation of variational calculus;geometric mechanics and field theories; symmetries and conservation laws ofdifferential equations, and pseudo-Riemannian geometry of homogeneous spaces. It also discusses algebraic applications to cryptography and number theory. Itoffers state-of-the-art contributions in the context of current researchtrends. The final result is a challenging panoramic view of connecting problemsthat initially appear distant.