Squirrelly.js is a blazing fast, lightweight JavaScript template engine offering a variety of features. It supports helpers, filters, partials, caching, and configurable delimiters, making it highly adaptable to diverse templating needs. Squirrelly focuses on performance and ease of use, making it a great choice for both server-side and client-side rendering. Its simple syntax and robust functionality contribute to efficient development and clean, maintainable code.