blas alternatives and similar packages
Based on the "Science and Data Analysis" category

gonum
Gonum is a set of numeric libraries for the Go programming language. It contains libraries for matrices, statistics, optimization, and more. 
gosl
Go scientific library for linear algebra, FFT, geometry, NURBS, numerical methods, probabilities, optimisation, differential equations, and more. 
gonum/mat64
The general purpose package for matrix computation. Package mat64 provides basic linear algebra operations for float64 matrices. 
TextRank
TextRank implementation in Golang with extendable features (summarization, weighting, phrase extraction) and multithreading (goroutine) support. 
sparse
Go Sparse matrix formats for linear algebra supporting scientific and machine learning applications, compatible with gonum matrix libraries. 
vectormath
Vectormath for Go, an adaptation of the scalar C functions from Sony's Vector Math library, as found in the Bullet2.79 source code. (currently inactive) 
ode
An ordinary differential equation (ODE) solver which supports extended states and channelbased iteration stop conditions. 
triangolatte
2D triangulation library. Allows translating lines and polygons (both based on points) to the language of GPUs. 
GoStats
GoStats is an Open Source GoLang library for math statistics mostly used in Machine Learning domains, it covers most of the Statistical measures functions. 
mudlarkgo
A collection of packages providing (hopefully) useful code for use in software using Google's Go programming language.
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README
Go implementation of BLAS (Basic Linear Algebra Subprograms)
Any function is implemented in generic Go and if it is justified, it is optimized for AMD64 (using SSE2 instructions).
AMD64 implementation uses MOVUPS/MOVUPD instructions if all strides equal to 1 so it run fast on Nehalem, Sandy Bridge and newer processors but relatively slow on older processors.
Any implemented function has its own unity test and benchmark.
Implemented functions
Level 1
Sdsdot, Sdot, Ddot, Snrm2, Dnrm2, Sasum, Dasum, Isamax, Idamax, Sswap, Dswap, Scopy, Dcopy, Saxpy, Daxpy, Sscal, Dscal, Srotg, Drotg, Srot, Drot
Level 2
not implemented
Level 3
not implemented
Example benchmarks
FunctionGeneric GoOptimized for AMD64 Ddot2825 ns/op895 ns/op Dnrm22787 ns/op597 ns/op Dasum3145 ns/op560 ns/op Sdsdot3133 ns/op1733 ns/op Sdot2832 ns/op508 ns/op