Users of the fine new open source Krita 4.x graphics software may be interested in Ezsaeger’s freebies on DeviantArt. A nice set of ink, ziptone and panels tools for comics makers, even including a panels gutter brush. Also a unique and rather nice stipple brush (I recently went through all the Krita brushes in v4 and v3, one by one, and there’s nothing like it). Despite being branded as “Mojo” they’re all for Krita 4.
These may also be useful for creatives who are looking for a suitable inking and finishing tool for Poser Comic Book renders, but without either… i) the bloat and cost of Photoshop, or ii) the fiddly complexity and cost involved in Clip Studio (Manga Studio). Both of which also have a far higher time-to-learn cost than Krita.
Krita also ships with its own comics tool. This is found under Settings | Dockers | Comics Manager, and can be very tricky to get started the first time. The Manager appears to be asking to load a non-existent .JSON file, but what it actually wants you to do is just to pick a folder to store stuff in. After that huge opening roadblock, using the Manager is fairly straightforward.