His Increased Building Limit Enhanced 4k is the safest to use of the mods that increase building budgets (not recommended on low end systems). DDProductions83 has quite a few essential mods. If you would like additional structural mods, check out Snap N' Build by ad3do. Speaking of Ethreon, all his mods should be considered. The nice thing about this mod is that Ethreon has taken over support for it so it's no longer abandoned and bugs are getting fixed. Settlement Supplies Expanded also adds quite a few items to the workshop, it has some overlap with Homemaker but is mostly focusing on different things I believe. But, I'm putting explanations of both in here because many many people prefer to use these. Homemaker just adds too much stuff that I don't want or need.

The SKE organization would be nice to have but not enough of the mods I use are compatible. But if you do decide to use a keywords mod (there are multiple), SKE is the only one currently being updated and supported. Any mods that use SKE will reorganize the vanilla menus significantly and any mods that use vanilla menus won't be compatible (unless they use script injected menus) However many mods have moved away from the keywords system. There are two versions, the one that requires SKE (settlement keywords extended) and one without.

Homemaker is a pretty popular settlement mod, it adds over 1000 items to the workshop menu you can build.

Fallout 1 essential mods