What are some alternatives?
ImageOptim - Faster web pages and apps.
Gravity Forms - Gravity Forms is one of the best and easiest contact form plugins to create modern forms for websites powered by widely-used WordPress.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Yoast Plugins - Yoast offers plugins to improve SEO and optimize web sites and blogs.
JPEGmini - JPEGmini - The Photo Optimization Tool Trusted by Tens of Thousands Image Perfectionists
Wordfence - Comprehensive security plugin for WordPress.