Calvin University's German Propaganda Archive preserves Nazi and East German propaganda alongside material produced for propagandists, giving researchers direct access to primary sources rather than summaries alone.
The Heaven's Gate website remains online as a disturbing primary artifact of 1990s Internet history, preserving the group's writings, transcripts, press material, and final public messages from before the deaths of 39 members in 1997.
Carmen Giunta's Classic Chemistry site has been putting foundational chemistry papers, historical calculations, obsolete terminology, anniversaries, and source-based teaching material online since the 1990s.
The University of Virginia's Salem Witch Trials Documentary Archive gathers court records, letters, sermons, diaries, maps and historical works into a durable research site built around primary sources.
The Great War Primary Documents Archive launched in 1995 and still organizes treaties, memoirs, images, naval material and other World War I sources in a classic Web structure.