Brunel v21r0 - released 7th November 2003
The table below list new features introduced in Brunel version v21r0, relative to version v20r1
| Subsystem | Item | Responsible | Status |
| Input/Output | Incompatible change to input and output event data format | C.Jones | RichKernel v4r0, EventSys v15r0 |
| Add L1Buffer to DST | M.Cattaneo | ||
| IT | Fix to material of IT frames | Y.Xie | XmlDDDB v19r0 |
| OT | Provide small default set of monitoring histograms | J.v.Tilburg | OTAlgorithms v13r3 |
| Rich | Use GSL instead of drteq4 in RichDetTools/RichReflector | ||
| Changes to monitoring | C.Jones | RichRecQC v1r2 | |
| Updates and new features in Ring Refit | M.Benayoum | RichRingRefit v1r2 | |
| Tracking | Track fit - speed up plus possibility to refit with outlier removal | J.v.Tilburg | TrFitEvent v4r1, TrFitter v3r7 |
| Changes to tuning parameters of extrapolation | J.v.Tilburg | TrExtrapolators v2r8 | |
| Fix uninitialised variables (bug 1673) | J.v.Tilburg | TrCheck v3r7 |