linmath.h alternatives and similar libraries
Based on the "Math" category.
Alternatively, view linmath.h alternatives based on common mentions on social networks and blogs.

OpenBLAS
OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version. 
Eigen
A highlevel C++ library of template headers for linear algebra, matrix and vector operations, numerical solvers and related algorithms. [MPL2] 
TinyExpr
tiny recursive descent expression parser, compiler, and evaluation engine for math expressions 
MIRACL
MIRACL Cryptographic SDK: Multiprecision Integer and Rational Arithmetic Cryptographic Library is a C software library that is widely regarded by developers as the gold standard open source SDK for elliptic curve cryptography (ECC). 
NT2
A SIMDoptimized numerical template library that provides an interface with MATLABlike syntax. [Boost] 
LibTomMath
LibTomMath is a free open source portable number theoretic multipleprecision integer library written entirely in C. 
ExprTK
C++ Mathematical Expression Parsing And Evaluation Library https://www.partow.net/programming/exprtk/index.html 
muparser
official repository of the muparser fast math parser library 
GMTL
Generic Math Template Library (forked from http://ggt.sourceforge.net/) 
blaze
highperformance C++ math library for dense and sparse arithmetic. [BSD] 
safe_numerics
Replacements to standard numeric types which throw exceptions on errors 
Versor
[older version] Versor 1.0 C++ library for conformal geometric algebra draw routines 
Xerus
A general purpose library for numerical calculations with higher order tensors, TensorTrain Decompositions / Matrix Product States and other Tensor Networks 
Mission : Impossible (AutoDiff)
A concise C++17 implementation of automatic differentiation (operator overloading) 
SLIMCPP
Simple Long Integer Math for C++. Lightweight crossplatform headeronly library what implements big integer arithmetic in С++17. 
ceval
A C/C++ library for parsing and evaluation of arithmetic expressions. 
macadam
Typegeneric math and numerical library supporting c99 and cpp98 (header only). 
GMP
A C/C++ library for arbitrary precision arithmetic, operating on signed integers, rational numbers, and floatingpoint numbers. [LGPL3 & GPL2] 
Armadillo
A high quality C++ linear algebra library, aiming towards a good balance between speed and ease of use. The syntax (API) is deliberately similar to Matlab. [MPL2]
Less time debugging, more time building
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README
linmath.h  A small library for linear math as required for computer graphics
linmath.h provides the most used types required for programming computer graphics:
vec3  3 element vector of floats vec4  4 element vector of floats (4th component used for homogenous computations) mat4x4  4 by 4 elements matrix, computations are done in column major order quat  quaternion
The types are deliberately named like the types in GLSL. In fact they are meant to be used for the client side computations and passing to same typed GLSL uniforms.