- Road Hog [road vehicles + trams, it's from the same author as Iron Horse and FIRS],

- U&Bridges [like in the name, rail/road bridges],

- U&RaTT [road/tram tracks with speed limits],

- U&ReMM2 [rail tracks with speed limits],

- Av9.8 Aircraft Set [planes, etc.],

- CHIPS Station Set 2.0 [very nice station set which has stations with waiting cargo animations]

If you want some updates for graphics in default OpenGFX, then I suggest adding: - OpenGFX+ Landscape [removes grid from the map, modifies snow line, enables snow in temperate climate],

- OpenGFX Trees [like in the name, replaces trees and adds trees at the roadside in the cities],

- Stolen Trees [yes, they were stolen at some point, adds very nice trees to the game]

- HEQS [heavy equipment road vehicles, is also good road vehicle set, I'm not sure if it works with all FIRS' cargo].

Also, author of the Iron Horse, FIRS and Road Hog is making a new mod with the ships, you can track the progress here: https://grf.farm/unsinkable-sam/preview-15/index.html. Also of his mods' changelogs, updates could be found here: https://www.grf.farm/