Mentioning some of my work below which is in active use by community.
Statsample-Timeseries is extension of Statsample, and incorporates helpful time series functions, estimation techniques, and modules, such as:
Statsample-Timeseries is part of the SciRuby project.
I started this as an independent project, it was later officially adopted by Instamojo.
This is the Ruby interface of Uber Developers API. This enables developers to integrate Uber's Drivers, Rides, Activities etc in their applications and workflows.
Duss is an open-source URL shortener written in GoLang. It works with any SQL variant.
It supports configuration of key length, url normalization and collisions handling. More features of duss are in the works.
It is an extension of Generalized Linear Models to Statsample, a suite of advance statistics in Ruby.
Find more details about the project below.
It is a quiz/treasure hunt hosting engine which I created years ago. It was tightly integrated with Facebook API.
The first instance of this application: