2Way Development
A Broader View Volunteers
Africa & Asia Venture
African Impact
African Self-Realization Project
Amani Chidren's Home
Amerispan Unlimited
Amizade
Art in Tanzania
Asylum Access
BaseCamp International Centers
Canadian Alliance for Development Initiatives and Projects CADIP
Center for Cultural Interchange (CCI)
Chipua Institute
Citizens Network for Foreign Affairs
Concordia
Creative Solutions Zanzibar
Cross-Cultural Solutions
Developing World Connections
Enjipai Community Project
Experiential Learning International
FoodWaterShelter
GAP Adventures
Give a Heart to Africa
Global Citizens Network
Global Crossroad
Global Leadership Adventures (teens)
Global Resource Alliance
Global Routes
Global Seekers
Global Service Corps
Global Vision International (GVI)
Global Volunteer Projects
Global Volunteers
Go M.A.D.
Greenforce
Greenheart Travel
Habitat for Humanity
Health Volunteers Overseas
IndependentVolunteer.org
Indigenous Education Foundation of Tanzania (IEFT)
inside/out
Inspire Volunteering
Institute of Field Research and Expedition
International Volunteer HQ
International Volunteers
Involvement Volunteers Association Inc.
i-to-i
Jubilee Ventures
Kaya Responsible Travel
kazi na afya
KIDS Worldwide
Latitude Global Volunteering
Livingstone Tanzania Trust
Living Water Children Centre
Maasai International Challenge
Madventurer
MACAO NGOs
Meru Peak School
New Hope Volunteers
Operation Crossroads Africa
Original Volunteers
Orphans of Kilimanjaro
Oyster Worldwide
Pathfinders
Path to Africa
Peace House Africa
Personal Overseas Development (PoD)
Planeterra
Project Concern International
Projects Abroad
proliteracy
Putney Community Service
Quest Overseas
RCDP International Volunteer
Reach the Children
Real Gap Experience
responsibletravel
Roadmonkey
Rustic Volunteer Travel
Saidia Tanzania
Service Civil International
Skillshare International
SPW-UK
SPW-USA
Students Travel and Exposure South Africa
Support For International Change
theleap
The One Person Project
The School of St Jude
Travellers Worldwide
TravelWorks
True Travellers Society
UCD Volunteers Overseas
United Planet
uVolunteer
Visions in Action
Volunteer Abroad
Volunteer Africa
Volunteer and Culture XPerience
Volunteer Healthcare Corps
Volunteer in Tanzania
Volunteering Solutions
Volunteer Kilimanjaro
Volunteers for Peace
VSO International
Warm Heart Art Tanzania
World Endeavors
World Vets
World Wide Opportunities on Organic Farms
Youth Challenge International