The websites of international courts, such as the International Criminal Court, or the International Criminal Tribunals for Former Yugoslavia or Rwanda are a good place to start exploring atrocity crime, with many offering summaries of cases, judgments, and even relatively full court transcripts and exhibits of evidence. For the ad hoc tribunals for the former Yugoslavia and Rwanda, records are now combined at the UN International Residual Mechanism for Criminal Tribunals Unified Court Records. You can also find examples of hybrid, international/domestic tribunals, such as the Extraordinary Chambers in the Courts of Cambodia.
Public, searchable databases are a good way to keep track of national and international court processes handling atrocity crime. The International Crimes Database aims to be comprehensive. The War Crimes Trial Database Project focuses on cases concerning the territory of Bosnia and Herzegovina.
Key human rights NGOs regularly publish reports on ongoing situations – among those best known are Human Rights Watch and Amnesty International. Institutions like International Crisis Group and Genocide Watch monitor situations where there is a risk of political violence or atrocity crime.
Various organisations exist to educate and maintain collective memory of atrocity. These include, the Aegis Trust, the National Holocaust Centre in the UK, and Memorial Center Srebrenica. Yale University has a project focusing specifically on Colonial Genocide.