You will get a ton of responses but here you go.

Tenshin Amaguriken (Forgive Spelling on these:  Technique Ranma learned
from Cologne.  Super Fast Punches.  Several Hundred per second.  A very
devestating move.  Used by Ranma and Cologne.  

Baski Tenkin:  (Breaking Point Technique).  Used on inorganic matter to
shatter it much like a grenade.  Mostly used on rock.  The technique
makes the user much tougher to physical damage.  It allows Ryoga to
become much tougher.  It also is good for smoke screens.  Ranma had to
use the Tenshin Amaguriken to overcome Ryoga's resistence.  

Shi Shi Hokaden:  Depression Blast.  Ryoga uses his manic depression to
generate Heavy Chi.  Then launches it into the air.  It lands back on
him and a blast radius is generated.  

Moka Takahishi:  Shi Shi Hokaden's poorer cousin.  It uses Ranma's
confidence to generate a chi blast.  Can range greatly in power.  Used
by Ranma when he is winning or finds purpose in the fight.  

Hiro Shoten Ha:  Dragon ascension punch.  Probably the most powerful of
all the techniques.  Uses the heat from the enemies anger, lust, or chi
to generate a heat source.  Ranma moves in a spiral forming a chi
vortex.  When Ranma reaches the center of the spiral he uses his cold
spirit or cool chi in an upercut.  It reacts with the hot chi forming a
tornado.  A very cold tornado.  Has been countered by both Taro, Herb,
and Happosi.   How?  Taro and Happi by not getting mad and releasing a
battle aura.  Herb being the master a chi turns his off at the last
second.   


Who uses what:

Ranma: Nekoken(By far most powerful technique), Hiro Shoten Ha, Moko
Takahishi, Tenshin Amaguriken, Shooting Star Kick, and several others.
The boy picks up techniques like bad habbits.  

Ryoga:  Baksi Tenchu,  and Shi Shi hokaden.  Despite many fanfic myths,
Ryoga is not a fast learner of special techniques.  But what he does
know he uses well.

Cologne:  Baksi Tenchu, Hiro Shoten Ha, Splitting Cat Hairs, Multiple
Pressure Points, and many more never revealed.

Happi:  Hapo Dakerin.  In short bombs.  Also has many chi attacks not
really given names too.  Most involve lust or serve some purpose of
Voyerism.

Rest of cast really has not shown much chi ability.  
They can generate a battle aura but can't manifest it into an attack.

Forgive the spelling  as I really never bother with the Japanese names.
After all they have the same meaning when translated into english. ^_-

Brad.  

DaBear

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