Projects:

gopkg.in/gcfg.v1 Package gcfg reads "INI-style" text-based configuration files with "name=value" pairs grouped into sections (gcfg files). (Prior version at code.google.com/p/gcfg)
gopkg.in/inf.v0 Package inf (type inf.Dec) implements "infinite-precision" decimal arithmetic. (Prior versions at speter.net/go/exp/math/dec/inf and code.google.com/p/godec/dec)
gopkg.in/pathlist.v0 Package pathlist manipulates lists of filepaths joined by the OS-specific ListSeparator (pathlists), usually found in PATH or GOPATH environment variables. (Prior version at speter.net/go/exp/path/filepath)

Experimental projects

gopkg.in/sconf/sconf.v0 Package sconf implements structured configuration, supporting "INI-style" text-based configuration files. It is an experimental evolution of the gcfg package.
speter.net/go/exp/math/big/pre128 Package pre128 is a thin wrapper for big.Int in math/big that preallocates a 128-bit array for storing the value.