Suggestions for Nicematrix

The following packages have something in common with the package Nicematrix. The packages are ordered in decreasing similarity.

Package matrix-skeleton: A PGF/TikZ library that simplifies working with multiple matrix nodes
Package kbordermatrix: LaTeX version of \bordermatrix
Package matrixdiagrams: Create structured matrix diagrams using TikZ
Package association-matrix: LaTeX support for creating association matrices
Package blkarray: Extended array and tabular
Package array: Extending the array and tabular environments
Package delarray: Delimiters for arrays
Package drawmatrix: Draw visual representations of matrices in LaTeX
Package bchart: Draw simple bar charts in LaTeX
Package letterswitharrows: Draw arrows over math letters
Package venndiagram: Creating Venn diagrams with TikZ
Package tensormatrix: Matrix representations of tensors
Package ltablex: Table package extensions
Package stabular: Multipage tabular
Package supertabular: A multi-page tables package
Package tabularray: Typeset tabulars and arrays with LaTeX3
Package xtab: Break tables across pages
Package spalign: Typeset matrices and arrays with spaces and semicolons as delimiters
Package luamesh: Computes and draws 2D Delaunay triangulation
Package karnaugh-map: LaTeX package for drawing karnaugh maps with up to 6 variables
Package witharrows: Aligned math environments with arrows for comments
Package chronology: Provides a horizontal timeline
Package todonotes: Marking things to do in a LaTeX document
Package commutative-diagrams: CoDi: Commutative Diagrams for TeX
Package bigdelim: Big delimiters in tabular or array
Package ctable: Flexible typesetting of table and figure floats using key/value directives
Package diagbox: Table heads with diagonal lines
Package ltcaption: Fix some caption problems in longtables
Package multirow: Create tabular cells spanning multiple rows
Package polytable: Tabular-like environments with named columns
Package threeparttable: Tables with captions and notes all the same width