Filters for PC:
Call TAG 718-225-5824 (718-Call-TAG) www.usanativ.comwww.techloq.com (Windows)
www.NetFree.link (Windows)
www.netsafepro.comwww.netsparkmobile.com/ (Android and Windows)
www.covenanteyes.com/services/internet-filtering /
http://webchaver.org/filtering.phpwww.netnanny.com (Android, iOS, PC, Mac)
https://truple.io (Android, Windows, [Mac, iOS coming soon]) - not so much a filter--randomly captures and shares screenshots with accountability partner.
http://www.livigent.com==built on Livigent==www.meshimer.comwww.geder.orgwww.gentechsolution.comMore info see
https://venishmartem.com/Israel http://www.etrog.net.il/http://www.enativ.com/http://netfree.link/http://www.rimon.net.il/http://shomer.shoresh.org.il/For Windows Phonewww.safekiddo.com/en_us/For Androidhttps://truple.io/androidfilter.html (Free android filter)
For iPhone/iPad/iOsCheck out their quite easy and powerful content restrictions.
Suggestion: Have someone else have the password (or half and half with a spouse) and do the following:
Lock installing apps + remove browser + add apps you need (possible rules: no games, no sports, no entertainment, etc.).
[Occasionally an app will have a built in browser/or need to access a certain website - just go back in to settings (with password) and add that website].
There is time restrictions and more features too.
(May not be enough for teenagers - consult your own advisers - this solution sure beats doing nothing and there is no excuse)
DNShttps://www.opendns.com/ (can be used in routers or directly in PC)
https://cleanbrowsing.org