NGOs working for nuclear prohibition:
Nuclear Age Peace Foundation
To educate and advocate for peace and a world free of nuclear weapons, and to empower peace leaders.Videos, publications, programs.
NuclearFiles.org: a project of Nuclear Age Peace Foundation, offering extensive material for educators, including, for example, detailed nuclear timelines for each of the years from the 30's through today.
Int'l Campaign to Abolish Nuclear Weapons
Mission: "ICAN is a global campaign coalition working to mobilize people in all countries to inspire, persuade and pressure their governments to initiate and support negotiations for a treaty banning nuclear weapons. The campaign was launched in 2007, with more than 300 partner organizations is now active in more than 80 countries worldwide."
ICAN has posted a Flickr album of annotated photos of the UN Ban Treaty negotiations.
Global Zero
About GZ: "We've spent years building a nonpartisan, international community of influential political, military, business, civic and faith leaders- matched by a powerful global grassroots movement. We're not tilting at windmills. We've got a plan. And it's backed by experts and leading newspapers worldwide. The challenge now is getting world leaders to act on it- and only unified, international public pressure can create the necessary political will to make it happen."
Reaching Critical Will
Very active on nuclear abolition. A project of the Women's International League for Peace and Freedom.
Nuclear Security Project
NSP is the earnest effort of George Schultz, William Perry, Henry Kissinger, Sam Nunn. "Reassertion of the vision of a world free of nuclear weapons and the practical measures toward achieving that goal would be, and would be perceived to be, a bold initiative consistent with America's moral heritage... The effort could have a profoundly positive impact on the security of future generations."
Of note: Nuclear Security Project partners listing
Nuclear Zero: Marshall Islands Lawsuit
Nuclear Watch's amicus brief is posted here (PDF).
The U.S. motion to dismiss and the other amicus briefs are available here.
Marshall Islands 4/24/14 complaint (PDF)
Abolition 2000
Abolition 2000 is an international global network of over 2000 organizations in more than 90 countries working for a treaty to eliminate nuclear weapons within a time-bound framework.
Reaching Critical Will
Reaching Critical Will is the disarmament program of the Women's International League for Peace and Freedom (WILPF), the oldest women's peace organization in the world. They published "Unspeakable Suffering: The Humanitarian Impact Of Nuclear Weapons". Extensive resources are available at the website, including country profiles, treaties, and fact sheets.
Vatican Holy See
"The Holy See shares the thoughts and sentiments of most men and women of good will who aspire to the total elimination of nuclear weapons."
50 Years After Pacem in Terris, The Holy See Insists on Nuclear Disarmament"
Spotlight
National Security Archive
A huge historical resource. Browse and search through thousands of declassified primary-source materials. (view)
Reports and Infographics:
Arms Control and Nonproliferation:
A Catalog of Treaties and Agreements
May 11, 2015. View/download PDF
Archive of statements to the 2015 Non-Proliferation Treaty Review Conference of the Parties
Chinese Nuclear Forces 2013
The Bulletin of Atomic Scientists
Nuclear weapons states -CNN interactive graphic
Nuclear Weapons Complex Interactive Map
The Union of Concerned Scientists has created an interactive map of the U.S. nuclear weapons complex sites in Google Earth, providing information, collected from public sources, about each facility. (more info, KML file, etc.)
Google interactive map of DOE sites
Prepared by the Alliance for Nuclear Accountability
DOE Map of Legacy Management Sites
FCNL- Nuclear Calendar
Managed by the Friends Committee on National Legislation
IPPNW Campaign Kit on Humanitarian Impacts
"The purpose of this kit is to provide ICAN campaigners- and all others working to prohibit and eliminate nuclear weapons- with the essential facts about the blast, burn, and radiation effects of nuclear weapons; the devastation they wreak upon the environment; and the inability of physicians to reach and treat the surviving victims of nuclear war; in language that is accessible, understandable, repeatable and, we hope, persuasive." (more)
Resource Guide on Nuclear Disarmament for Religious Leaders and Communities
The President of the Republic of Costa Rica, H.E. Mrs. Laura Chinchilla Miranda, today launched a Resource Guide on Nuclear Disarmament for Religious Leaders and Communities at a high level consultation held in the United Nations in New York. The Resource Guide (click here for a preview copy) was developed by Alyn Ware and the Basel Peace Office for Religions for Peace, a global coalition of representatives of the world's major religions.
50 Years Of Nuclear Weapons Development
From a 1998 Department of Defense manual on "Weapons of Mass Destruction Technologies", this chart traces the worldwide spread of nuclear technology from 1942. (click to view)
Uranium Mining and the U.S. Nuclear Weapons Program
A Public Interest Report from the Federation of American Scientists, by Robert Alvarez, fall 2013.
Article online / PDF Version
Waste Lands: America's Forgotten Nuclear Legacy
The Wall St. Journal has compiled a searchable database of contaminated sites across the US.
Related WSJ article:
"A Nuclear Cleanup Effort Leaves Questions Lingering at Scores of Old Sites; Years Later, the Legacy of the U.S. Arms Buildup Remains Near Homes, Parks and Malls"
Online Course From William Perry:
Living at the Nuclear Brink: Yesterday & Today
"Because most people do not understand just how serious these dangers are today, their governments are not taking adequate preventive actions: actions that are readily achievable. And so, we are drifting towards a nuclear catastrophe. This is why I have dedicated the balance of my life to educate the public about these dangers, and this is the reason I have created this course." (sign up here)
Nuclear Weapons- Reports & Analysis
Alliance for Nuclear Accountability
ANA is an alliance of 30+ local watchdogs and national organizations (Nuclear Watch is a member), 'working to empower citizens to take action and to protest an opaque and mismanaged nuclear complex'.
From ANA's 'about us' statement: "Through our collective action, we have shut down nuclear weapons sites that were contaminating local communities, established funds for monitoring and technical assessment, and ensured that federal facilities are subject to state environmental enforcement. We have blocked dangerous nuclear weapons programs, supported more responsible management plans, and worked to decommission hazardous nuclear reactors. We know how to win against an often intransigent government and contractors that waste billions of taxpayer dollars through mismanagement and, sometimes, sheer incompetence."
Arms Control Association
Resources: by countries, by subject, reports, threat assessments, fact sheets, issue briefs.
Federation of American Scientists
'The Federation of American Scientists is one of the longest serving non-governmental organizations devoted to reducing nuclear dangers and other threats to national and international security by providing rigorous, nonpartisan, technical analysis and recommendations to policymakers and the public. FAS works on a variety of issues including nuclear weapons, radiological and nuclear terrorism... non-proliferation and counter-proliferation.' Of particular interest: F.A.S. Strategic Security Blog. See also issue briefs, reports, publications.
Bulletin of the Atomic Scientists 
Home of the Doomsday Clock and a deep online resource. The Bulletin has been published continuously since 1945, when it was founded by former Manhattan Project physicists after the atomic bombings of Hiroshima and Nagasaki. The Bulletin's primary aim is to inform the public about nuclear policy debates while advocating for the international control of nuclear weapons.
UCS: All Things Nuclear
The Union of Concerned Scientists' site covering nuclear weapons and nuclear power.
Of note: the "Nuclear Energy Activist Toolkit"
Ploughshares Fund
Ploughshares is a major voice in nuclear arms reduction and non-proliferation efforts.
Recommended: Early Warning- Ploughshares' daily email alert on nuclear news. The website is information-rich; see for example the World Nuclear Stockpile Report
StrategicDemands.com
"Our goal is to add independent perspective and opinion to the contemporary national security debate. We bring experience and a belief that the current Washington DC/New York/Boston corridor that holds most all foreign policy think tanks is limited in its politics..." (read on)
Nuclear Threat Initiative
NTI: Reports and Analysis
James Martin Center for Non-Proliferation Studies
Mission: "CNS strives to combat the spread of weapons of mass destruction by training the next generation of nonproliferation specialists and disseminating timely information and analysis. CNS at the Monterey Institute of International Studies is the largest nongovernmental organization in the United States devoted exclusively to research and training on nonproliferation issues."
Arms Control Wonk Podcast
By Jeffrey Lewis, Aaron Stein
Harvard Belfert Center Nuclear Security Matters
Carnegie Endowment: Nuclear Weapons
Nuclear Disarmament Resource Collection
Nuclear Information Service (UK)
EU Non-Proliferation Consortium
CTBTO Preparatory Commission
(Comprehensive Nuclear Test-Ban Treaty Org.)
Workshops and trainings, Educational Resources, Conference Series.
Deep Cuts
First Report of the Deep Cuts Commission
Lawyers Committee on Nuclear Policy
Global Incidents and Trafficking Database
Institute for Energy and Environmental Research
IEER provides activists, policy-makers, journalists, and the public with understandable and accurate scientific and technical information on energy and environmental issues arising from nuclear power, nuclear weapons, and nuclear waste.