Good prisoner mod

[Mogvaj]

I am planing on startin a playthrough where i would have a second colony comprised mostly of prisoners and just a few wardens. The way it would work is that the secondly colony would just be there for extra production and it would be great if there are any mods to enable me to do that with prisoners.

[Dr0nubi]

My favorite slave-go-to mod is Prison Labor since I usually don't want prisoners to do nothing but stone cutting. By default only crafting, mining and cooking are allowed, but you have the ability to change job restrictions in the mod settings (in theory, I never managed to force my prisoners to smooth or build walls).
However maybe in your case Simple Slavery is a better match, as prisoners will become actual pawns you can directly control.
Each one has motivation mechanics and the threat of insurrection, with prison break attempts. Maybe test them both to see which one fits you better

[Preechr]

In addition to the above two mods, there is also a mod called Locks that lets you define specifically who can and cannot go through doors. Prison Labor will keep your prisoners on a separate list, where with Simple Slavery, your slaves will be mixed in with your regular colonists. Both have pros and cons, but with Simple Slavery it can be difficult to locate a slave trying to escape, especially if you haven't confined their allowed areas. On the other hand, your slaves have separate escape criteria where prisoners will often attempt escape in groups, depending on how you set up their sleeping areas.

Prison Labor prisoners pretty much will not do any construction labor last I checked, and if they are not supervised they might stop working altogether. There is an option to provide "motivation" for prisoners, but I've never played with it on. They will do pretty much anyother type of work though, other than Wardening of course. It can be tricky to restrict prisoner meals if you want them to do all the cooking, and dressing them can also be more difficult than you'd think. In either case, you might want to look into non-lethal weapon mods to keep them under control.

Slaves will require the construction of slave collars, and your regular colonists will wear them eagerly, so you'll need to make some of those and then disallow them for your regular colonists. The collars may not actually be required, though. Since slaves function as just another colonist but with a chance of revolt, they may be considered a little overpowered, so you may need to provide your own balance to get any sort of realism.

You can also run both mods at the same time if you choose. Depending on what you are trying to do, you could also run DeepRim and keep them all underground, severely limiting their possibility of escape. It can be tricky to get prisoners down the mine shaft, but its possible.