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NJA\u2010CFS is designed to perform simulations of electronic structure properties, including the magnetic ones, for transition metals and lanthanoid complexes, giving access to several CF\/LF parametrization schemes, from point\u2010charge model and AOM to AILFT parameters, putting great effort in the implementation of routines for CF parameters manipulation and rotation. NJA\u2010CFS was designed to meet the needs of both first\u2010time users of crystal field theory and those who require a high degree of flexibility in the choice of crystal field parameters formalisms. In this manuscript, we present the theoretical foundations of the program routines and the comparison of NJA\u2010CFS calculation results either to experimental data or ab\u00a0initio computations, proving the advantages that access to multiple CFPs formalism can bring in. We also present intuitive applications of the NJA\u2010CFS routines to didactically valuable examples, like the projection of CF\/LF splitting on real d\u2010 and f\u2010 orbitals and the calculations of Tanabe\u2013Sugano diagrams for arbitrary symmetries and with the inclusion of spin\u2010orbit coupling.<\/jats:p>","DOI":"10.1002\/jcc.70063","type":"journal-article","created":{"date-parts":[[2025,3,8]],"date-time":"2025-03-08T17:34:27Z","timestamp":1741455267000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Not Just Another Crystal Field Software"],"prefix":"10.1002","volume":"46","author":[{"given":"Letizia","family":"Fiorucci","sequence":"first","affiliation":[{"name":"Department of Chemistry \u201cUgo Schiff\u201d Universit\u00e0 degli Studi di Firenze  Florence Italy"},{"name":"Magnetic Resonance Center Universit\u00e0 degli Studi di Firenze  Florence Italy"},{"name":"Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine  Florence Italy"},{"name":"Max\u2010Planck\u2010Institut f\u00fcr Kohlenforschung Kaiser\u2010Wilhelm\u2010Platz 1  M\u00fclheim an der Ruhr Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enrico","family":"Ravera","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cUgo Schiff\u201d Universit\u00e0 degli Studi di Firenze  Florence Italy"},{"name":"Magnetic Resonance Center Universit\u00e0 degli Studi di Firenze  Florence Italy"},{"name":"Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine  Florence Italy"},{"name":"Florence Center For Data Science Universit\u00e0 degli Studi di Firenze  Florence Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,3,3]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"CAMMAG, a FORTRAN Computing Package","author":"Cruse D. 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