> Reviews, comments, and recommendations from the community, and the largest collection of software alternatives including a wide expanse of filtering options.
> Lists of services to avoid and alternatives to them, specific to avoiding projects like {{< rawhtml >}}<a href="https://en.wikipedia.org/wiki/PRISM_%28surveillance_program%29">PRISM</a>, <a href="https://en.wikipedia.org/wiki/XKeyscore">XKeyscore</a> and <a href="https://en.wikipedia.org/wiki/Tempora">Tempora</a>{{< /rawhtml >}}.
> A collection of only open source software with a focus on the types of licenses, can provide out of date information and seems to be less maintained recently.
> At the time of declassification there was a list released of current providers for the program were Microsoft, Google, Yahoo!, Facebook, PalTalk, YouTube, Skype, AOL, and Apple.