Screens is great, from what I've heard. I have used Jump Desktop, but might switch, as it's been slow/buggy for me lately.
I really like Timing. It tracks your time on different apps, and gets as granular as individual websites. You can classify things in different categories and levels of productivity. It's good for people like me that waste too much time on SlickDeals You can use it to track for billing on the higher licenses. I used it on Trial, but didn't like the continual charging they do for updates. That said, this is a pretty good deal to get it. Even if you value the rest of the bundle at the $1/$0.60 AC minimum, that makes Timing $7.16. That said, you can get some of the utility of it with the free Usage app.
All except MacReviver (1 yr) are lifetime licenses. PDF Expert by itself is worth 29.99, and that matches previous low prices on Mac App Store (MAS). It was $20 when it first came out, but has never been that low since. It's $40 right now on developer Readdle's site. It's way better than overpriced Acrobat licenses.