unoda-en
The United Nations Office of Disarmament Affairs (UNODA):

The UN office charged with overseeing all issues related to both conventional and nuclear disarmament.

UNRCDP
The United Nations Regional Office for Peace and Disarmament in Asia and the Pacific (UNRCPD):

The regional UN office mandated with implementing the UN Programme of Action on Small Arms and the Arms Trade Treaty.

IANSA
International Action Network on Small Arms (IANSA):

The leading civil society coordinator for small arms issues, IANSA has affiliates around the world, including PSAAG.

SmallArmsSurvey
The Small Arms Survey:

A prominent research body studying small arms issues around the world; a first stop for research on armed violence.

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ATT Baseline Assessment Project

The Baseline Assessment Project helps governments identify capacity gaps and place small arms issues in their global context.

UNSCAR
 UN Trust Facility Supporting Cooperation on Arms Reduction (UNSCAR):

A multi-donor UN fund which supports implementation of the UN Programme of Action and the Arms Trade Treaty.

attsecretariat
The Arms Trade Treaty:

Check out the Arms Trade Treaty official website for the latest conference documents, state reports and other ATT related resources

Control Arms
Control Arms:

Control Arms is a global civil society network 'advocating for a bullet proof Arms Trade Treaty.' PSAAG is a member.

Gunpolicy
Gunpolicy.org:

The world’s largest and most accessible online publisher of evidence on the impacts and regulation of firearms.