Suggestions for splines

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

Package mp-geom2d: Flat geometry with METAPOST
Package fiziko: A METAPOST library for physics textbook illustrations
Package byrne: Typeset geometric proofs in the style of Oliver Byrne’s 1847 edition of Euclid’s Elements
Package huffman: Drawing binary Huffman trees with METAPOST and METAOBJ
Package mp-gears: Draw systems of intermeshing gears with METAPOST
Package mp-neuralnetwork: Drawing artificial neural networks with METAPOST and METAOBJ
Package roundrect: METAPOST macros for highly configurable rounded rectangles (optionally with text)
Package repere: METAPOST macros for secondary school mathematics teachers
Package mpchess: Drawing chess boards and positions with METAPOST
Package mptrees: Probability trees with METAPOST
Package interpol: Add interpolation to METAPOST graph package
Package cmarrows: METAPOST arrows and braces in the Computer Modern style
Package exteps: Include EPS figures in METAPOST
Package epsincl: Include EPS in METAPOST figures
Package featpost: METAPOST macros for 3D
Package hatching: METAPOST macros for hatching interior of closed paths
Package latexmp: Interface for LaTeX-based typesetting in METAPOST
Package metapost-matlab: METAPOST data plotting in Matlab style
Package mpattern: Patterns in METAPOST
Package textpath: Setting text along a path with METAPOST
Package txp: Draw text along a path
Package threeddice: Create images of dice with one, two, or three faces showing, using METAPOST
Package bpolynomial: Drawing polynomial functions of up to order 3
Package metaobj: METAPOST package providing high-level objects
Package metapost-colorbrewer: An implementation of the colorbrewer2.org colours for METAPOST
Package venn: Creating Venn diagrams with METAPOST
Package automata: Finite state machines, graphs and trees in METAPOST
Package blockdraw_mp: Block diagrams and bond graphs, with METAPOST
Package dviincl: Include a DVI page into METAPOST output
Package drv: Derivation trees with METAPOST
Package makecirc: A METAPOST library for drawing electrical circuit diagrams