Gettext is a GNU gettext-like program for Ruby. The catalog file(po-file) is same format with GNU gettext. So you can use GNU gettext tools for maintaining.

A simple, fast, memory-efficient and threadsafe implementation of GetText

Detect stegano-hidden data in PNG & BMP files.

ac-library-rb is a ruby port of AtCoder Library (ACL). DSU(UnionFind), FenwickTree, PriorityQueue, Segtree, SCC, 2-SAT, suffix_array, lcp_array, z_algorithm, crt, inv_mod, floor_sum, max_flow, min_cost_flow......

A general parser using the Earley algorithm.

Daru (Data Analysis in RUby) is a library for analysis, manipulation and visualization of data. Daru works seamlessly accross interpreters and leverages interpreter-specific optimizations whenever they are available. It is the default data storage gem for all the statsample gems (glm, timeseries, etc.) and can be used with many others like mixed_models, gnuplotrb and iruby. Daru Lite is a fork of Daru that aims to focus on data manipulation and stability.

A Ruby library for error-free computation via homomorphic encoding of rational numbers.

Part of IB-Ruby. Tools to to access the tws-api comfortably.

Gem for getting palindromic prime numbers

Test primes faster than Ruby's default methods by using the Miller-Rabin method.

Roaring bitmaps for Ruby

Secret sharing with Ruby.

Basic tools, utilities and conveniences for microtonal music making and analysis

This gem can generate Ulam spiral and also shows result on console