FreezePage is described as 'Free online service for freezing web pages. Save, share and prove what is on the web at a specific point of time'. There are more than 10 alternatives to FreezePage, not only websites but also apps for a variety of platforms, including Mac, Windows, Self-Hosted solutions and SaaS. The best alternative is Wayback Machine, which is free. Other great sites and apps similar to FreezePage are Archive.is (Free), Archive.st (Free), TechRewind (Free) and Time Travel (Free).
Social Feed Manager is open source software for libraries, archives, cultural heritage institutions and research organizations. It empowers those communities’ researchers, faculty, students, and archivists to define and create collections of data from social media platforms.
Captures screenshots, downloads source code, and monitors DNS records helping you keep track of changes on your websites without needing to restore from a backup. Think of it like the Wayback Machine on steroids.