Old to be obsoleted:
serial only:
adc65 - added in 2005, might have been outdated even then.
256x256 pixels
barbie - is from 2000
casio - last functional change 2005
dimera - last functional change in 2003
fuji - last functional change 2002
jd11 - is from 2001
kodak_dc120 - last bugreport from 2006
kodak_dc210 - last report from 2005
kodak_dc3200 - last functional change 2002
konica_qm150 - last functional change 2003 (not even googlable)
konica - from 2001
largan_lmini - last functional change 2004
minolta_dimage - last functional change 2007
panasonic_coolshot - last reports in 2002
panasonic_dc1000 - last reports in 2002
panasonic_dc1580 - last reports in 2002
panasonic_l859 - last reports in 2002
polaroid_pdc320 - old serial, last change in 2003
ricoh - from 2003
samsung - last changes in 2002
sonydscf1 - 1997 camera
sonydscf55 - 1999 camera, changes from 2002
agfa_cl20 - last functional change 2004
clicksmart310 - last functional change 2006
digita - last cameras released in 2001
enigma13 - last functional change in 2004
gsmart300 - last functional change 2004
hp215 - last functional changes 2005
iclick - last functional change 2004
jamcam - last functional change 2002
kodak_ez200 - last changes in 2007 by me
lg_gsm - last functional change 2005
mustek - last changes in 2002, ported from gphoto 0
pccam300 - last functional change 2004
pccam600 - last functional change 2004
polaroid_pdc640 - last report from 2005
polaroid_pdc700 - last work around 2004
ricoh_g3 - last reports from 2005
sipix_blink - was never working well i think
sipix_blink2 - last functional change 2003
sipix_web2 - last functional change 2002
smal - last functional change 2003
soundvision - last functional changes in 2003
spca50x - last additions in 2004
stv0674 - last functional changes from 2002
stv0680 - last functional changes from 2003
sx330z - last functional changes from 2003
toshiba_pdrm11 - last functional changes from 2003
Keep:
aox - last functional change 2008
ax203 - last functional change 2014
canon - still has known users, active 2019
digigr8 - functional changes in 2012
directory - generic directory driver, keep
jl2005a - last functional change 2010
jl2005c - last functional change 2012
mars - last functional change 2010
pentax - pentax slr, active 2019
ptp2 - PTP, active
sierra - still has users, also some cameras
sonix - last functional changes in 2008
sq905 - last functional change 2010
st2205 - changes in 2014
topfield - last changes in 2008, (HD recorder, might still be in use)
tp6801 - last changes in 2011
kodak_dc240 - last report from 2004
Reply from a user in 5.2019 its in active use.
ricoh_g3 - report in 2019 https://github.com/gphoto/libgphoto2/issues/454