What if a martial character was skilled enough in combat to not only attack and move of his turn, but also on others. Yeah, fighters with Abrupt Jaunt zipping around the battlefield.

THE BASE CLASS:
The Soldier
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Alignment

Any.
Hit Die

d10.
Class Skills

The Soldier’s class skills (and the key ability for each skill) are Climb (Str), Craft (Int), Diplomacy (Cha), Handle Animal (Cha), Jump (Str), Ride (Dex), and Swim (Str).

Skill Points at 1st Level

(2 + Int modifier) ×4.

Skill Points at Each Additional Level

2 + Int modifier.

Soldier
{table="head"]Level|BAB|Fort|Ref|Will|Special

1st|+1|+2|+0|+2|Bonus Attack 1/enc

2nd|+2|+3|+0|+3|Bonus Move 2/enc

3rd|+3|+3|+1|+3|

4th|+4|+4|+1|+4|Bonus Attack 2/enc

5th|+5|+4|+1|+4|Bonus Move 2/enc

6th|+6/+1|+5|+2|+5|

7th|+7/+2|+5|+2|+5|Bonus Attack 3/enc

8th|+8/+3|+6|+2|+6|Bonus Move 3/enc

9th|+9/+4|+6|+3|+6|

10th|+10/+5|+7|+3|+7|Bonus Attack 4/enc

11th|+11/+6/+1|+7|+3|+7|Bonus Move 4/enc

12th|+12/+7/+2|+8|+4|+8|

13th|+13/+8/+3|+8|+4|+8|Bonus Attack 5/enc

14th|+14/+9/+4|+9|+4|+9|Bonus Move 5/enc

15th|+15/+10/+5|+9|+5|+9|

16th|+16/+11/+6/+1|+10|+5|+10|Bonus Attack 6/enc

17th|+17/+12/+7/+2|+10|+5|+10|Bonus Move 6/enc

18th|+18/+13/+8/+3|+11|+6|+11|

19th|+19/+14/+9/+4|+11|+6|+11|Bonus Attack 7/enc

20th|+20/+15/+10/+5|+12|+6|+12|Bonus Move 7/enc[/table]

Weapon and Armor Proficiency
A soldier is proficient with all simple and martial weapons and with all armor (heavy, medium, and light) and shields (including tower shields).

Bonus Attack(Ex)
Once per encounter, a soldier may make one extra bonus attack with any weapon he is holding using his full base attack bonus, plus any modifiers appropriate to the situation as a free action. This attack can be performed at any time, even on another character's turn. A soldier gains an additional bonus attack at 4th level and every 3 soldier levels thereafter (7th, 10th, 13th, 16th, 19th).

He can only may use a number of bonus attacks per round equal to the number of attacks he'd get for a high base attack bonus.


Bonus Move(Ex)
At the second level, once per encounter, a soldier may perform one extra move-equivalent action as a free action. This action can be performed at any time, even on another character's turn. A soldier gains an additional bonus move actions at 5th level and every 3 soldier levels thereafter (8th, 11th, 14th, 17th, 20th).

He can only may use a number of bonus move actions per round equal to his Dexterity modifier.


THE FEATS
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Quick Move [General]
Prerequisite
Dex 13, Improved Initiative, base attack bonus +3.

Benefit
Once per encounter, you may perform one extra move-equivalent action as a free action. This action can be performed at any time, even on another character's turn.

Special

A fighter may select Quick Move as one of his fighter bonus feats.


Greater Quick Move [General]
Prerequisite
Dex 15, Improved Initiative, Quick Move, base attack bonus +6.

Benefit
Once per encounter, you may perform one extra move-equivalent action as a free action. This action can be performed at any time, even on another character's turn. This bonus action stacks with Quick Move.

Special

A fighter may select Greater Quick Move as one of his fighter bonus feats.

Quick Attack [General]
Choose one type of weapon. You can also choose unarmed strike or grapple as your weapon for purposes of this feat.

Prerequisites

Proficiency with selected weapon, Weapon Focus, base attack bonus +1.

Benefit
Once per encounter, you may perform one extra attack with chosen weapon as a free action. This attack can be performed at any time, even on another character's turn.

Special
You can gain Quick Attack multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon.

A fighter may select Quick Move as one of his fighter bonus feats.


THE VARIANTS
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Barbarian:
This barbarian loses Fast Movement, Uncanny dodge, Improved uncanny dodge; but gets one Bonus Attack per encounter while in a rage.

Monk
This monk gains one Bonus Move per encounter at 1st, 10th, and 20th level; but loses his enhancement bonus to unarmored speed, bonus to Armor Class when unarmored (he still retains Wisdom bonus to AC when unarmored). He can only use these moves when unarmored.
This monk also loses his bonus feat at the 2nd level to gain a Bonus Attack at this levels but only with unarmed strikes or with special monk weapons.

Fighter
This fighter trades his bonus feats at 2nd, 10th, and 18th for one Bonus Attack per encounter at each of these levels. The fighter also trades his bonus feats at the 6th and 16th levels for one Bonus Mover per encounter at each of these levels.

Paladin
This paladin loses Lay on hands, turn undead, remove disease but gain a Bonus Attack whenever he would receive smite evil (1st, 5th, 10th, 15th, 20th). This target of the paladin's Bonus attack must be evil.

Ranger
This ranger no longer gains a +2 bonus on weapon damage rolls against his favored enemies. Instead he gains on Bonus Attack per encounter at the 1st, 5th and every 5 levels thereafter. However he can only target his favored enemies with these attacks.



Effects:

Bonus moving out of an attack or spell's target square would be rampant. Old school combat wouldn't start until people ran out of "free dodges".

Bonus move plus Full attack would be painful to squishes. At higher levels, spellcaster who get no bonus moves will have to rely on their allies to use bonus attack to trip/disarm/bullrush the moving full-attackers.

What other effects did I miss?

And Yes. This is broken since the current system never intended for characters performing so many actions out of turn. Bt it would be interesting to play.