The best open source alternative to Slant is Free Software Directory, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Slant and 13 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Slant are Libre Projects (Free, Open Source), SaidIt.net (Free, Open Source), The Linux Alternative Project (Free, Open Source) and switching.software (Free, Open Source).
Uncensored free speech alternative to the extreme Reddit and Voat forums, democratically civilized by Graham's Debate Pyramid, no illegal transactions nor porn. Truth-seeking anti-corruption news are among the popular themes. Android app, iOS soon.
WikiSpooks is a global alternative encyclopedia on politics, spy craft, deep state intelligence, and conspiracies, free of corporate influence, partisan politics, or government propaganda for historians and truth-seekers to read, edit, and share.