Not specific to stretches but I’m pretty sure I’ve seen it recommended here or in one of the UA books but Jill Miller’s The Roll Model is basically a soft tissue self-care bible. I’m pretty heavy for a runner so my feet and ankles take some abuse and it’s been a great tool for keeping everything working properly.
I’ve never looked at the book but I’ve heard good things about Kelly Starrett’s Becoming a Supple Leopard. I followed his Mobility WOD site back in my crossfit days and there are some shoulder and hip exercises that I picked up from it that I still do to this day.