Sonatina Symphonic Orchestra is a free orchestral sample library. While not as advanced or ambitious in scope as commercial offerings, SSO contains all the basic building blocks for creating real virtual orchestrations. It’s primarily aimed at beginners, but also more experienced composers looking for something lightweight and/or portable might find it useful.
SSO comes in a single 440MB zip archive that unpacks to 503MB. SSO comes in sfz format and the samples are stereo, 16 bit, 44kHz. Melodic instruments and chromatic percussion are sampled in minor 3rds. Staccato/pizzicato patches have 2x round-robin. All samples have varying amounts of stage ambience, depending on their front-to-back placement, but in addition to that a good hall reverb is a must.