SkyPath
I use a bunch of tools when planning the imaging session. I usually use Telescopius to find the target. Unfortunately (or fortunately), telescopius doesn't know anything about the things (like trees and houses) that obstruct the view for me.
To solve this I use NINA's search and horizon features to see whether the target would clear the obstructions. But NINA is on a completely different computer that sits on the telescope, so I have to connect it to power, start it up, connect to it remotely and then run NINA. And if I want to see what the target trajectory looks like from a different location, I have to load a different horizon and enter different coordinates into NINA.
SkyPath is a simple web app that combines celestial object ephemeris and your local horizon. It allows you to create "observatories", which are just coordinates and a NINA horizon file, and then check what the object path looks like from that location.
In addition to observatories, you can also create "rigs" - combination of a telescope and a camera. This allows you to see the target in the field of view of your equipment.
Skypath runs completely in your browser, no need for registration, accounts or sharing your data. The observatories and rigs you create are stored locally in your browser. Give it a try if you feel like it: SkyPath. The source code is available on GitHub.