2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171581We describe OpenFCI, an open source implementation of the full configuration-interaction method (FCI) for two-dimensional quantum dots with optional use of effective renormalized interactions. The code is written in C++ and is available under the Gnu General Public License. The code and core libraries are well documented and structured in a way such that customizations and generalizations to other systems and numerical methods are easy tasks. As examples we provide a matrix element tabulation program and an implementation of a simple model from nuclear physics, in addition to the quantum dot application itself.13 pages, 2 figuresMesoscale and Nanoscale Physicstext