The best open source alternative to K9 Web Protection is NextDNS. If that doesn't suit you, our users have ranked more than 25 alternatives to K9 Web Protection and six of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to K9 Web Protection are Pi-hole, LeechBlock, Squid and CacheGuard Gateway.
NextDNS protects you from all kinds of security threats, blocks ads and trackers on websites and in apps and provides a safe and supervised Internet for kids — on all devices and on all networks.
Blocks ads for all connected devices at the DNS layer without client setup. Provides web control, in-app ad and tracker blocking, DHCP and API support, regex filtering, privacy modes, audit logs, and long-term query analytics for network management.
LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator.
CacheGuard Gateway is a free, open-source network security appliance for startups, growing businesses, and SMEs/SMBs that need enterprise-grade protection without the complexity or cost.
Temptation Blocker is a program that lets you lock yourself out of specific applications for a specified period of time. A window displays how much time remains. In order to unblock a program you must enter a 32 character string as a disincentive.
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Pi-hole does not have content filtering like K9 Web Protection did where you could have it scan the contents of a web page for a keyword and block if it matched.