In Tarrastra, we use the "Fractional Base Bonuses" house rule from the Unearthed Arcana. This recognizes that all attacks and saves are actually based on fractional increases per-level, which are rounded down. When you have a multi-classed character and use the standard tables from the PHB, you may end up with worse attacks and saves because you are adding together two rounded-down numbers, rather than rounding down after adding two fractional numbers.

There are five simple formulae which determine what a particular character class's attack or save bonus is at a given level. Each class has one (or two) "good" saves (+2 at level 1 and +12 at level 20), and two (or one) "poor" saves (+0 at level 1 and +6 at level 20). Similarly, each class either has a "good" attack bonus (+1 at level 1 and +20 at level 20), an "average" attack bonus (+0 at level 1 and +15 at level 20), or a "poor" attack bonus (+0 at level 1 and +10 at level 20).

Base Attack Bonus (Good)	(Class Level × 1)
Base Attack Bonus (Average)	(Class Level × ¾)
Base Attack Bonus (Poor)	(Class Level × ½)
Base Save Bonus (Good)	2 + (Class Level × ½)
Base Save Bonus (Poor)	(Class Level ÷ 3)

To determine a character's Base Attack Bonus and Base Save Bonuses, apply the above formulae to each of the character's classes, add up the results, and round down.

To do for each class:

1. Hit Die
2. Class skills
3. Skill Points
4. Weapon and armor proficiency
5. Starting Gear

PC classes

Barbarian stuff.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor
Bard stuff.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Good Base Save Bonus (Will): Good
Cleric stuff.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Druid stuff.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Fighter stuff.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor
Monk stuff.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Good Base Save Bonus (Will): Good
Paladin stuff.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor
Ranger stuff.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Good Base Save Bonus (Will): Poor
Rogue stuff.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Good Base Save Bonus (Will): Poor
Sorcerer stuff.
	Base Attack Bonus: Poor Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Swashbuckler Swashbucklers are agile warriors with uncanny battle insight. They use mobility and precision to harry their foes, outlasting even those much more powerful than they. Swashbucklers may be honorable or dastardly; the former may serve as defenders of the weak while the latter take naturally to life as a brigand. The class is detailed in Complete Warrior. Swashbucklers are proficient with basic weapons, light blades, and any one other weapon group at 1st level. They are proficient with light armor, but not with shields.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor
Wizard stuff.
	Base Attack Bonus: Poor Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good

NPC classes

Adept npc spellcaster...
	Base Attack Bonus: Poor Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Aristocrat Educated wealthy individuals born into high position.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Commoner Everyone else in the world.
	Base Attack Bonus: Poor Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor
Expert Non-adventuring craftsfolk and professionals.
	Base Attack Bonus: Average Base Save Bonus (Fortitude): Poor Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Good
Warrior Experienced fighters without sophisticated training.
	Base Attack Bonus: Good Base Save Bonus (Fortitude): Good Base Save Bonus (Reflex): Poor Base Save Bonus (Will): Poor

Racial Paragon classes

The racial paragon classes won't simply be available to anyone who wants to take them: only those characters who accomplish some remarkable achievement relevant to his race will be eligible to gain levels in a paragon class.

Paragon Human

Paragon Dwarf

Paragon Elf

Paragon Gnome

Paragon Halfling

Paragon Aasimar

From www.andycollins.net

Paragon Tiefling

Paragon Drow

Just as the drow are a semi-mythical race, stories of mighty exemplars of that race remain the stuff of legends. But if the race truly does exist, you can be sure that paragon drow will be out seeking to subjugate the races of the light.

Prestige classes

Speak to the DM if you are curious about a specific class and don't have the required source book.

Arcane Archer (Dungeon Master's Guide)

No human sharpshooter can approach the uncanny accuracy and power of an elven arcane archer.

Requirements to become an Arcane Archer

Race:	Elf.
Base Attack Bonus:	+6.
Feats:	Point Blank Shot, Precise Shot, Weapon Focus(Bows).
Spells:	Ability to cast 1st-level arcane spells.

Archmage (Dungeon Master's Guide)

The most powerful arcane spellcasters are often archmages, who give up some of their spell capability in order to learn to twist and control their other spells in powerful ways unavailable to less focused mages.

Requirements to become an Archmage

Skills:	Knowledge (Arcana) 15 ranks, Spellcraft 15 ranks.
Feats:	Skill Focus (Spellcraft), Spell Focus in two schools of magic.
Spells:	Ability to cast 7th-level arcane spells, knowledge of 5th level or higher spells from at least five schools.

Hierophant (Dungeon Master's Guide)

Powerful divine spellcasters who delay receiving the most powerful spells can learn to channel and control divine energy in powerful and unexpected ways.

Requirements to become a Hierophant

Skills:	Knowledge (Religion) 15 ranks.
Feats:	Any metamagic feat.
Spells:	Ability to cast 7th-level divine spells.

Shadow Dancer (Dungeon Master's Guide)

Tricky and deceptive, nimble and adept at weaving through patches shadow, shadow dancers are mysterious artists of light and darkness.

Requirements to become a Shadow Dancer

Skills:	Move Silently 8 ranks, Hide 10 ranks, Perform (dance) 5 ranks.
Feats:	Combat Reflexes, Dodge, Mobility.

Virtuoso (Song and Silence)

Extroverted, charming, and talented, the virtuoso loves nothing better than to entertain - and gains some powers while doing so that leave lesser bards with their mouths agape.

I'm doing this using Prestige Feats, secrets of a bardic college, taught for free, one per bard level, once the character qualifies and joins the organization.

NPC Prestige classes

Assassin (Dungeon Master's Guide)

Even the most protected sovereign fears the assassin: the knife in the dark striking with deadly precision, poisoned, as often as not, the assailant disappearing into the shadows and escaping with impunity. What uncanny powers do these fiends wield?

Blackguard (Dungeon Master's Guide)

The quintessential black knight, these vile villains lead armies of undead and even command demons, while striking down any and all who are good or holy! Or such is their reputation.

Ur-priest (Book of Vile Darkness)

Only the most experienced clerics speak in horrified whispers of these vile spell-thieves. How dare they siphon off the divine power being sent by the deities to their faithful priests? What blasphemy!