The popular LADSPA plugin suite has just seen a new release, version 0.9.24. This release includes "a number of bug fixes and improvements as well as changes intended to make it more suitable for low-power systems."
There is also a new/resurrected plugin, CabinetIII, which implements a "simplistic linear emulation of several guitar amplifier loudspeaker cabinets with reduced computational complexity".
Also of note is that the compressor plugins now show a gain reduction meter in hosts that support it.
For full details of changes for this release, check out the Caps plugin website