Metropolis is originally created by Matthias Vogelgesang and is available from https://github.com/matze/mtheme as well as CTAN. More information about the theme, including the design principles, can be found at http://bloerg.net/2014/09/20/a-modern-beamer-theme.html. This version demonstrates the use of a progress bar under the frame titles. See the manual for other customisation options.
This is an unofficial Indian Institute of Technology Bombay Beamer Presentation Template (modified version). Feel free to use it, modify it, and share it.
This template is adapted from THU Beamer Theme and DLUT Beamer Theme, the contents, fonts, navigation bar, color matching and logo are modified. Note that smoothbars are replaced by miniframes as external themes. On the basis of mathematical formulas, tikz and linguex are added as examples.