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It is particularly suitable for experiments where the interaction point is unknown, such as experiments with extended target volumes. The  package includes vertex finding tools and fitting with kinematic constraints, such as mass hypothesis and four-momentum conservation, as well as combinations of these constraints. The new package is distributed as an open source software via GitHub. This paper presents a comprehensive description of the KinFit package and its features, as well as a benchmark study using Monte Carlo simulations of the <jats:inline-formula><jats:alternatives><jats:tex-math>$$pp\\rightarrow pK^+\\Lambda \\rightarrow pK^+p\\pi ^-$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:mo>\u2192<\/mml:mo>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:msup>\n                      <mml:mi>K<\/mml:mi>\n                      <mml:mo>+<\/mml:mo>\n                    <\/mml:msup>\n                    <mml:mi>\u039b<\/mml:mi>\n                    <mml:mo>\u2192<\/mml:mo>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:msup>\n                      <mml:mi>K<\/mml:mi>\n                      <mml:mo>+<\/mml:mo>\n                    <\/mml:msup>\n                    <mml:mi>p<\/mml:mi>\n                    <mml:msup>\n                      <mml:mi>\u03c0<\/mml:mi>\n                      <mml:mo>-<\/mml:mo>\n                    <\/mml:msup>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula> reaction. 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