change.org
avaaz.org
care2.com
takepart.com
changemakers.com
betterplace.org
design21sdn.com
netsquared.org
causecast.org
gofabby.com
itex.com
barterquest.com
bizx.com
repetitionr.com
apc.org
civicus.org
mobileactive.org
spannerfilms.net
yourcause.com
thepetitionsite.com
kintera.org
idealist.org
volunteermatch.org
ipetitions.com
dosomething.org
habitat.org
riseup.net
teachforamerica.org
petitiononline.com
yesmagazine.org
surfrider.org
civicactions.com
onlinevolunteering.org
grassroots.org
fixmystreet.com
hackersforcharity.org
nationalservice.gov
isna.net
transitionnetwork.org
cityyear.org
dothegreenthing.com
globalonenessproject.org
global-changemakers.net
publicstuff.com
pledgebank.com
sfcg.org
minesandcommunities.org
ioby.org
silentmajorityny.org
nycares.org