This provides ability to crawl public activities of users.

You can detect slow query in real time by using this plugin.

You can integrated log monitoring system with Hatohol

Fluentd doesn't guarantee message order but you may keep message order.

Grn2drn is a command to convert a *.grn dump file to a JSONs file for Droonga.

Grnline is created by Ruby. This uses [grnwrap](https://github.com/michisu/grnwrap) as a reference. grnwrap is created by Python.

Groonga command line clients can work without Groonga. `groonga` command provided by Groonga can only use for GQTP but they can use for both GQTP and HTTP.

[Groonga](http://groonga.org/) is a full text search engine. It also provides column store based database feature. Column store based database means that aggregate calculation is fast. You can use Groonga server as fast full text search server and fast [OLAP](https://en.wikipedia.org/wiki/Online_analytical_processing) (OnLine Analytical Processing) server.

Groonga-schema is a Ruby library and tool to processes [Groonga](http://groonga.org/)'s schema.

Racknga is a Rack middlewares that uses Rroonga features.

Red Arrow GDK Pixbuf adds `Arrow::Tensor#to_pixbuf` and `GdkPixbuf::Pixbuf#to_arrow`. `Arrow::Tensor#to_pixbuf` returns a `GdkPixbuf::Pixbuf`. `GdkPixbuf::Pixbuf#to_arrow` returns a `Arrow::Tensor`.

Red Arrow GSL adds `Arrow::*Array#to_gsl`/`Arrow::Tensor#to_gsl` for Apache Arrow to GSL conversion. Red Arrow GSL adds `GSL::Vector#to_arrow`/`GSL::Vector::Int#to_arrow`/`GSL::Matrix::*#to_arrow` for GSL to Apache Arrow conversion.

Red Arrow NMatrix adds `Arrow::Tensor#to_nmatrix` for Apache Arrow to NMatrix conversion. Red Arrow NMatrix adds `NMatrix#to_arrow` for NMatrix to Apache Arrow conversion.

Red Arrow Numo::NArray adds `Arrow::Tensor#to_narray` and `#to_arrow`/`#to_arrow_array` to `Numo::NArray`'s numerical subclasses such as `Numo::Int8`. `Arrow::Tensor#to_narray` returns a `Numo::NArray`'s numerical subclass such as `Numo::Int8`. `#to_arrow` returns a `Arrow::Tensor`. `#to_arrow_array` returns an `Arrow::Array` instance if the original object is an 1 dimensional array.

Red Arrow PyCall adds `#to_python` method to most Ruby objects for Apache Arrow such as `Arrow::Array`. Red Arrow PyCall adds `to_ruby` method to most Python objects for Apache Arrow such as `pyarrow.lib.Int8Array`.

[OpenCV][opencv] is a computer vision library.