* [geom](https://github.com/skelterjohn/geom) - 2D geometry for golang
* [go-fn](https://code.google.com/p/go-fn/) - Mathematical functions written in Go language, that are not covered by math pkg
* [go-gt](https://code.google.com/p/go-gt/) - Graph theory algorithms written in "Go" language
* [go.matrix](https://github.com/skelterjohn/go.matrix) - linear algebra for go (has been stalled)
* [gocomplex](https://code.google.com/p/gocomplex/) - A complex number library for the Go programming language.
* [gofrac](https://github.com/anschelsc/gofrac) - A (goinstallable) fractions library for go with support for basic arithmetic.
* [gohistogram](https://github.com/VividCortex/gohistogram) - Approximate histograms for data streams
* [gonum/mat64](https://github.com/gonum/matrix) - The general purpose package for matrix computation. Package mat64 provides basic linear algebra operations for float64 matrices.
* [gonum/plot](https://github.com/gonum/plot) - gonum/plot provides an API for building and drawing plots in Go.
* [goraph](https://github.com/gyuho/goraph) - A pure Go graph theory library(data structure, algorith visualization)
@ -685,6 +688,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
* [go-dry](https://github.com/ungerik/go-dry) - DRY (don't repeat yourself) package for Go.
* [go-underscore](https://github.com/tobyhede/go-underscore) - A useful collection of helpfully functional Go collection utilities.
* [goback](https://github.com/carlescere/goback) - Go simple exponential backoff package.
* [godaemon](https://github.com/VividCortex/godaemon) - Utility to write daemons
* [godotenv](https://github.com/joho/godotenv) - A Go port of Ruby's dotenv library (Loads environment variables from `.env`.)
* [godropbox](https://github.com/dropbox/godropbox) - Common libraries for writing Go services/applications from Dropbox.
* [gohper](https://github.com/cosiner/gohper) - Various tools/modules help for development.
@ -697,13 +701,16 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
* [jsonf](https://github.com/miolini/jsonf) - Console tool for highlighted formatting and struct query fetching JSON.
* [lrserver](https://github.com/jaschaephraim/lrserver) - LiveReload server for Go
* [mp](https://github.com/sanbornm/mp) - A simple cli email parser. It currently takes stdin and outputs JSON.
* [multitick](https://github.com/VividCortex/multitick) - Multiplexor for aligned tickers
* [netbug](https://github.com/e-dard/netbug) - Easy remote profiling of your services.
* [ngrok](https://github.com/inconshreveable/ngrok) - Introspected tunnels to localhost.
* [okrun](https://github.com/xta/okrun) - go run error steamroller