pluckyfilter.com
Plucky is an Internet filter intended to help users keep long-term goals by enforcing self-set boundaries. It offers image blocking, a configurable delay before sites are allowed, scheduled blocking and blackout hours, and fine-grained filtering. It is available on Windows, macOS, Linux, and Android. A 30-day free trial is offered, after which subscription costs $2-$15 per month depending on income.