The drums from the Ultimate v2.5 soundfont (available in the 'Collections' category, the soundfont has been renamed to Musica Theoria). The drums were sampled from Roland SoundCanvas SC-55 and SC-88. There are 17 different drumsets, including standard, power, electronic, jazz, brush.
Ian Wilson has created a series of soundfonts containing drumsets from old drum-machines and synths. There are a lot of different drums, perfect for "backdrop" percussion. This soundfont contains all drumsets in the series. The drumkits are also available as individual soundfonts with smaller sizes.