What are some alternatives?
When comparing CanJS and PuTTY, you can also consider the following products
Vue.js - Reactive Components for Modern Web Interfaces
MobaXterm - MobaXterm is a software that uses a set of optimized network tools included in a single exe file. MobaXterm integrates several network clients with an X server, and also integrates a full set of Unix based commands. Read more about MobaXterm.
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
ConEmu - ConEmu-Maximus5 is a full-featured local terminal for Windows devs, admins and users. Get better console window with tabs, splits, Quake style, copy+paste, DosBox and PuTTY integration, and much more.
Aurelia - Next gen JS framework written with ES6 and ES7. Integrates with Web Components. No external dependencies except polyfills.
KiTTY - KiTTY is a fork from version 0.70 of PuTTY. It adds extra features to PuTTY.