Collecting indexers

While my initial motivation to try usenet was to find releases that weren't being seeded on torrent trackers, I've found it to be a helpful alternative to keeping content seeded on my laptop's limited hard drive for extended amounts of time. To increase the chances that I find what I'm looking for, I check several usenet indexers simultaneously, preferring to use ones that have lifetime subscriptions (altHUB, Miatrix, and NZBGeek). Should those three lack what I'm looking for, I also use DrunkenSlug, NZB Finder, and Tabula Rasa, as their free plans can be used indefinitely. Aside from the six aforementioned indexers, are there any good ones that I've missed with free plans that don't expire?

From what I remember DogNZB, NinjaCentral, and NZBPlanet either have limited-time free plans or require account activity at least once every two weeks, which is why I chose to forego them in favor of the six I use now.