data science

Open Data Science Conference
Re-Work
QCon.ai
AnacondaCON
The Data Science Conference

programming languages/javascript

JSConf - Conferences for the JavaScript Community

programming-languages/processing

Processing Day India

programming languages/python

List of Upcoming Python Conferences Worldwide
List of Python Conferences & Workshops Worldwide
Official PyCon Website

programming languages/r

R: Conferences

programming languages/ruby

RubyConf India
RubyConf
Deccan RubyConf, India