Bagpipes from The British Islands:

Great Higland Bag Pipes. 

GHBP Normal Pitch is not in tune with other instruments. 

Mouth Blown. Separate Stocks for drones, Drones rest across shoulder. Normal Tuning A~480 hz.. Drones in A , a, a.  There are only 9 Notes available from Low G to High A.

GHBP Concert Pitch. 

As for GHBP except, A=Bb 466HZ.. Usually requires special chanters, chanter and drone reeds and transposed music scripts for other instruments.  There are other instruments that normally need transpositions to play against Piano and Organ such as Bb, Clarinets, Saxophone, Trumpet etc. However they are normally directly in tune to a piano key (concert pitch), unlike the normal pitched GHBP.

A chart is available here if you wish to know more. Great Highland Bag Pipe and Concert Pitch

Scottish Small Pipes. 

Mouth or Bellows Blown. Drones in one stock and played across the lap. Tuning Concert A or D., but other variations exist including chanter pitch and drone selection.

Northumbrian (North East England) Small Pipes. 

Drones in single stock across lap.

Scottish Fireside Pipes.

Not sure exactly but appears to have 3 drones resting on the shoulder, at 3 different pitches and are likely to be smaller and quieter than the GHBP.

Scottish Border Pipes (Half-long pipes).

Single Drone Stock, played across the lap Drones in A, a, e', or A, a, a .

Uillean Bagpipes (Ireland). 

More than one octave.. Developed from Pastoral Pipes. Single Stock with Drones played across the lap.

Great Irish Warpipes. 

Separate stocks for drones, drones rest on shoulder. Similar to GHBP.

Zetland Pipes. 

From the Shetland Islands. The pipes consisted of a mouth-blown blowpipe, a single bass drone, and a single-reeded chanter in the key of D. This key was chosen as it was ideally suited for much of the Celtic repertoire. The single-reed gave the chanter a mellow sound, akin to the Swedish sackpipa.