i've worked through those that weren't building before and they either now build or have a reminder saying why not. i've added a few more recently and have just sorted the list, here it is as it stands;
# lv2 and firewire basics
lv2-git
raul-git
suli-git
serd-git
lilv-git
sord-git
ganv-git
libffado-svn
# audio system and control
jack2-git
cadence-git
qjackctl-git
ubuntustudio-controls-git
pavucontrol-compact-git
# session management
raysession-git
# host, routing, etc.
carla-git
synthpod-git
non-mixer-lv2-git
guitarix-git
purr-data
element-git
vcvrack-git
# daw
zrythm-debug-git
# collections
dpf-plugins-git
gxplugins-lv2-git
invada-studio-plugins-lv2
tal-plugins
# synth
surge-synthesizer-git
bristol
remid.lv2-git
stegosaurus-lv2-git
# effects
hybridreverb-git
dragonfly-reverb-git
wolf-shaper-git
bshapr-git
bslizr-git
bchoppr-git
# in a class of it's own
moony-lv2-git
# samplers etc.
loopp-git
drmr-falktx-git
drumgizmo-git
ninjas-git
ninjas2-git
konfyt-git
# sequencers
sequencer64-git
bsequencer-git
# midi etc
pizmidi-git
midimonster-git
# audio formats and tools
alac-git
flacsync-git
fmedia-git
streamlink-git
# audio file naming/tagging
picard-git
picard-plugins-git
# misc
broot
imlib2-webp-git
# not working atm
## build problem -
https://github.com/kmatheussen/radium/issues/1235
#radium
## too big to build
#mixxx-git
## dependency conflift problem
#ingen-git
## build problem on Arch
#beast-git
# missing a dependency for rpc.h
#pd-extended
## output log too long
#pd-l2ork
## missing dependencies
#lmms-git
## nah like, too big
# ardour-git