There were not that many different instruments used in the baroque period, there are four main types of instrument, strings, woodwind, brass and keyboards.

In the strings section there was lutes, violins, violas, viols, contrabasses and harps.

Lute
Lute.jpg
Violin
violin.jpg
Viola
viola.jpg
Viol
voil.jpg
Contrabass
contrebass.jpg
Harp
harp.jpg

The viol:
Bowed stringed instrument popular from about 1500 to about 1750 and revived in the 20th century for early music. The viol rests vertically on the player's knees, hence its Italian name viola da gamba (leg viol). The bow is held palm outward and is slightly convex (in contrast to the concave violin bow). Made in three principal sizes (treble, tenor, and bass), the viol has a deep body and sloped shoulders; a back that angles back sharply near the neck; a violin like bridge; C-shaped sound holes; and tied-on gut frets that contribute to its clear, penetrating sound. The six gut strings are tuned (in the tenor) G c f a d1 g1 (c

C below middle C; d1

D above middle C), a tuning shared by the viol's relative, the lute. The treble tuning has the same pattern starting on d; the bass, starting on D. Less common was the double bass, tuned an octave lower; it was one ancestor of the modern double bass. In the 1500s and 1600s a consort, or ensemble, of viols was a favourite medium for chamber music by such composers as Purcell. With the rise of the orchestra in the 1700s the violin drove the treble and tenor viols from prominence. The bass viol persisted, its most famous virtuoso being the French player Marin Marais. Music for bass viol includes the Brandenburg Concerto no. 6 by J. S. Bach. (Baroquemusic.com)

Another group used a lot was the woodwind group.

Flute
flute.jpg
Oboe
oboe.gif
Bassoon

Recorder
recorder.jpg


The Bassoon:
bassoon (It. fagotto). Bass member of the double reed family, pitched in C, with a range from Bb upwards for about 3 1/2 octaves. Made of wood and with a conical bore. Dates from 1660s. Came to prominence as solo instrument in 18th century. Vivaldi composed 39 concerti for it. Others to use it as solo instrument include J. C. Bach, Telemann, and Boismortier. In 1774, Mozart wrote his concerto (K. 191). Modern instruments made by Heckel (Ger.), Buffet-Crampon (Fr.), and Fox (Amer.). Often used for comic effect but its capacity for melancholy has not been overlooked by composers. (baroquemusic.com)


Another section that was frequently use was the brass section.

Trumpet
Trumpet.jpg
Sackbut
Sackbut.jpg
Trombone
trombone.gif
Horn
horn.jpg


The Sackbut:
Musical instrument, the immediate predecessor of the modern trombone, made of thin, hammered metal, with a shallow, flat mouthpiece and a narrow, nonflaring bell. The instrument produced a soft sound that complemented the harpsichord, voice, viol, lute, recorder, and cornett. The English name sackbut (along with its French and Spanish cognates) was used from the mid-15th century until the 18th century, when the Italian term trombone came into general use. The sackbut was made in at least four sizes, from soprano to bass. It probably evolved as a lower-pitched version of the Renaissance slide trumpet, which first appeared at the ducal court of Burgundy in the 15th century. Like the trombone, the sackbut featured a predominantly cylindrical bore, narrower than that of the trombone, and a telescopic slide to alter the pitch by increasing or decreasing the length of the tube. Also like the trombone, the sackbut was constructed in three sections: the mouthpiece; the slide joint, an assembly consisting of two parallel and stationary tubes attached by a crossbar, or stay, and covered by a long, U-shaped sleeve (the telescopic slide tube), itself supported with a stay; and the bell joint, a U-shaped tube terminating at the bell. The mouthpiece was inserted into one end of the slide joint, and the bell joint was inserted into the other. The bell joint could be fitted with crooks to change the pitch, and the slide joint often had a hinged handle attached to the stay that enabled the player to slide it further than the length of the arm. The pitch was lowered as the player extended the slide away from the mouthpiece. (baroquemusic.com)
There were not that many different instruments used in the baroque period, there are four main types of instrument, strings, woodwind, brass and keyboards.