2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96814We define and investigate properties of universal operator algebras of directed graphs. Results include free products decomposition and continuity of the construction with respect to direct limits. Lastly we prove some K-theoretic results about our algebras.19 pages, uses xypic, submitted to Houston Journal of MathematicsOperator AlgebrasCommutative Algebra47L40text