Ghost in the Shell: SAC_2045
A spin-off of Ghost in the Shell: Stand Alone Complex.

The Melancholy of Haruhi-chan Suzumiya
A parody of The Melancholy of Haruhi Suzumiya.

Pacific Rim: The Black
A spin-off of Pacific Rim.

Pokemon Generations
An anthology series based on the Pokemon video games (not the TV series or movies).

Sailor Moon Crystal
ANN; A.V. Club; Crunchyroll; Hulu; IMDb; TV Tropes; VIZ Media; Wikia; Wikipedia

This 2014 original net animation a reboot of the 1990s anime Sailor Moon, apparently based more closely on the manga than the old anime series was. (But I've never read the manga.) Anyway, I could watch this online, but first I want to rewatch the entire old anime series on Hulu, which should take a couple of years. (Also, my internet is painfully slow these days, so I'm trying to limit how much stuff I watch online.) But I definitely want to see this, eventually.