Last week I created this little minimalist app with vanilla JavaScript, having features such as current weather, to-do list, etc. It’s entirely open-source. Check its GitHub repository for more details.
From the project’s readme file:
Focus is an application that aims to help you better organize your day. It contains interesting features as well as astonishing background images and beautiful minimalist responsive design. It is built with vanilla JavaScript and its whole code weights less than 25kb!
Online demo: https://focus.dthlabs.com
Source code: https://github.com/xdth/focus
Screenshots: