Since I have more than a hundred repositories now, I thought it would be helpful to create a sitemap, organized by topics.

Note that forks (for adding pull requests) are not included. Also, a good part of these repositories are abandoned projects, so don't expect that everything should work.

I'm pretty sure I won't update this after every new repo, so some things may be missing.

First here are some of the projects that may be of general interest:

• dfo: One-file C++ implementations of several derivative-free optimization algorithms. Select one and just drop it in your project.
• libgeom: A very lightweight C++ geometry library containing the esseentials - 2D & 3D points/vectors, 2x2 and 3x3 matrices, B-spline curves & surfaces, triangle meshes.
• geo-framework: An extensible 3D geometry visualizer in C++/Qt, suitable for testing out ideas. Includes interrogation methods such as contouring, mean curvature map, isophote lines etc.
• qds-viewer: A visualizer for a collection of (possibly trimmed) B-spline surfaces. Based on a predecessor of geo-framework. Supports exact normals and mean/Gaussian curvatures.
• gyorstalpalo: Very compact grammar summaries for a few natural languages (in Hungarian). Currently includes Swahili, Indonesian and Persian.
• scanned-dictionary: A webpage that helps you search for a word in a scanned dictionary. Easily extensible (currently supporting R. S. McGregor's Hindi-English, H. Wehr's Arabic-English, M. Haas' Thai-English, and the Aryanpur Concise Persian-English dictionaries). Note that scanned pages are not included for reasons of copyright.

Next comes the topic-based list:

This is by far the largest group, so it is divided further.

• cl-nurbs-tests: Various fairing algorithm tests, based on CL-NURBS
• class-a-curves: Testing various curve representations.
• discrete-clothoids: Test implementation of discrete clothoid curves
• ekcurves: Epsilon-kappa curves
• ksurf: Mesh-based surfaces using kappa-curves
• pseudo-g2: A testbed for experimenting with ribbon-based curves
• quartic: Quartic (and cubic) B-spline interpolation tests
• trigo-basis: Surface tests with the generalized trigonometric basis

• csg-script: A simple implicit modeling test system scriptable in Scheme
• dual-contouring: Minimal dual contouring library
• dual-primal: Dual/primal optimization of MarchingCubes meshes
• implicit-curvature: Curvature computation for implicit surfaces
• implicit-fit: Experiments with fitting implicit surfaces on a loop of curves.
• implicitize: Implicitization of polynomial surfaces
• ipia: Implicit Progressive-Iterative Approximation
• ldni: A CPU implementation of Layered Depth-Normal Images for experimenting
• liming: Generalization of Liming-curves
• marching: Marching cubes implementation
• marching-surface: Experiments with the marching surface idea
• polygonizer: A wrapper over Jules Bloomenthal's implicit surface polygonizer

• biharmonic-spatch: Creating S-patches from Sabin nets
• c0coons: Multi-sided C0 Coons patch with rational Bézier boundary curves
• concave-gb: Concave GB patches
• curved-domain: Curved domain tests
• curved-patch: N-sided surface with a curved domain
• displacement: Testbed for displacement patches
• dual-surface: Multi-sided dual surface representation
• gb-center: Minimal library computing the center point of GB (and other) patches
• gordon-wixom: Gordon-Wixom C1 interpolation
• harmonic: Harmonic coordinate computation library
• libmec: Minimal Entropy Coordinate library
• manifold: An n-patch-based construction similar to Zorin's
• midpoint: Minimal library for MidPoint patches.
• molihua: Polyhedral modeling with CD-GB patches
• multiloop: Test the parameterization of domains with multiple loops
• natural-neighbors: Framework for testing a natural neighbor based idea
• nielson: Nielson's triangular patch
• permanence: Permanence patch experiments
• qgb: Quadratic GB patch
• sabin-multiloop: Transfinite patch handling multiple loops, based on Sabin's 1998 paper
• sketches-plugins: Surface plugins for the Sketches modeling system
• spatch: S-patch in Haskell
• tensor-conversion: Experiments on converting an n-sided patch to a trimmed tensor product surface
• toric: Toric patch evaluator
• transfinite: Transfinite interpolation surface library
• xsolid: Framework for testing the ideas described in "The X construction"
• zheng-ball: An implementation of the Zheng-Ball multi-sided surface

• bezier-bspapprox: Approximate a Bézier curve with a B-spline of lower degree
• bezier-extractions: Computation of Bézier extraction matrices
• bezier-reduction: Optimal degree reduction for Bézier curves
• bezier-triangle: Minimal Bézier triangle evaluation
• bspline-connect: Lightweight library for connecting BSpline patches with G1/G2 continuity
• cl-nurbs: A NURBS library in Common Lisp
• clamp: Periodic to clamped B-spline curve conversion
• libgeom: Geometry library containing the essentials
• minibb: Minimal Bézier/B-spline curve library based on The NURBS Book
• optimize-curve-depth: Find the best depth given a 2D B-spline curve and a view direction

• conic-fit: Implicit conic fit on a polyline
• fit-sphere: Fitting a sphere with fixed radius on noisy data points.
• fit-test: B-spline surface fitting testbed
• least: Least polynomial interpolation
• profile-fitter: Fit a polyline (maybe later some curve) on an unordered, noisy point cloud.
• quadfit: Fit continuously connected B-spline surfaces on sampled points with boundary constraints
• quadric-fit: Implicit quadric fit on a triangle mesh
• vertebra-fit: Fitting a closed B-spline on a series of points defining vertebrae

• 3dviz: 3D animations demonstrating projections
• geo-framework: Basic framework for 3D geometry applications
• isophotes: Isophote line texture generator
• isoptic: Isoptic surface generation for meshes
• jet-wrapper: Jet fitting normals & curvatures (CGAL wrapper)
• qds-viewer: Quad patch viewer
• sample-framework: A minimal 3D framework for creating simple applications (deprecated, see geo-framework)
• sfview: NURBS surface visualizer (old project, see qds-viewer)
• strange-problem: Strange fitting problem
• subdivision: Exercises from Analysis and Design of Univariate Subdivision Schemes (by M. Sabin)
• trimult: Linux port of Ming Zou et al.'s 3D polygon triangulation library
• weingarten: Testing (embedded) Weingarten maps

• dosszioz: Our SAYC-based bidding system
• magic-keys: Magic Keys Bot Competition
• malom: A simple Nine Men's Morris game implementation
• obake-meiro: A maze generator for my daughter
• tetris: A tetris implementation in Clojure

• advent: This is a meta-repo for my Advent of Code solutions, linking to the repositories below:
  • advent2015 (in Common Lisp)
  • advent2016 (mainly in Prolog)
  • advent2017 (in Standard ML)
  • advent2018 (in Common Lisp)
  • advent2019 (in Prolog)
  • advent2020 (mainly in Nim)
  • advent2021 (mainly in Standard ML)
  • advent2022 (mainly in AWK)
  • advent2023 (in Tcl)
  • advent2024 (in 25 different languages)
  • advent2025 (in Janet & OCaml+Containers)
• aqua: AquaQ Challenge Hub solutions
• icfp2014: My submission to the ICFP '2014 contest
• icfp2015: My submission to the ICFP2015 contest
• synacor: My solution to the Synacor challenge

• core-forth: A minimal Forth system implementing the 2012 standard
• lispkit: A Scheme implementation of the SECD virtual machine, and a LispKit Lisp compiler
• ngaro-asm-x86: An x86 assembly implementation of the Ngaro Virtual Machine
• minivm: A minimal 8-bit virtual machine for didactic purposes

• erbi-practice: ErBi input method learning program
• qanyulogus: A program for organizing all the videos, CDs / DVDs at home
• scanned-dictionary: A webpage that shows a given page of a scanned dictionary
• wubi-practice: WuBi input method learning program

• formalis: A short summary of interesting topics in generative grammars & automata
• gyorstalpalo: Grammar notes for a few natural languages
• persian-poems: Hungarian translation of Persian poems
• programnyelv: A tutorial on creating a functional programming language based on combinatoric logic
• prolog-konyv: Problem solving in Prolog for people new to programming
• prolog-leckek: Introductory programming lessons in Prolog

• bibtex: BibTeX entries of my publications
• dfo: Testing some derivative-free optimization algorithms
• laser-pointer: A transparent window functioning as a laser pointer
• magnify: Magnifying glass effect
• parse-args: A small Common Lisp utility library similar to getopt
• progfun-assignments: Assignments of the Coursera course Functional Programming Principles in Scala
• sicp: A CL translation of the examples/solutions in the Wizard Book