To generate finder charts I use

http://server7.sky-map.org/

The beta version (click the mouse icon in the upper left) is easier to navigate. You can search on NGC, IC, UGC, PGC, PK, etc and these are also labeled when you mouse over them. You can also mouse over field stars to get their magnitudes.

For tracking comets I use

http://cometchasing.skyhound.com/

and

https://theskylive.com/comets


The Sky Live site is also good for finding where the planets and asteroids are currently.