That is why I provided links to them.
The Karma Mod makes the shifts in Karma a little more realistic. Instead of a few short good or evil deeds that pushes you to Saint or Devil, it takes more constant behavior to shift to the extremes.
The Slow Leveling mod is pretty what you have, Crash, but it only effects the amount of experience to level. It doesn't lower combat or quest XP, it just expands how much experience needed to gain each level by a huge chunk.
FOOK adds in a lot of material. New guns, new sounds, new armor, new textures, a crap tone of stuff. MMM does the same but it focuses more on critters and NPCs that you meet and fight. Adds a new super mutant type, and diversifies the critters so there are less repeated looks.
The Ultimate Perk Pack brings in about 100 new perks. SOme are granted based on what you do in game, others are granted by completing specific quests, with the rest being chosen as normal.