I am keeping this page available in case some of you still might find it useful.
Though many links may still be working, your safest course would be to do a web search on the organization name or firm name in order to find the latest link.
Multi-day cruise experiences may vary. Try to find someone who has actually cruised on whichever ships you are considering.
Note that some of these firms are apparently agencies, as they are offering cruises on the same ships.
For smaller vessels, please visit the Hotel Boats and Barges page.
Waterways World magazine Cruising - program has been discontinued
Lord of the Glens - 54 passengers; Scotland
Croisieurope - numerous rivers
Peter Deilmann Cruises has ceased river cruise operations
Noble Caledonia Ltd. - variety of ships and destinations
Viking River Cruises - operates 25 vessels; (web site in english, deutsch, francais, italien)
Voyages Jules Verne - France, Spain, Portugal, Italy, Sweden, Germany, Russia, Ukraine, Siberia(!); they’ve arranged their website and now the river cruises are hard to find
DDSG Blue Danube- (english, deutsch)
Uniworld - USA-based river cruise agency
Tauck River Cruising - 3 ships, 118 max passengers each; Danube, Rhine, Rhône, etc.
Cruise In - UK-based agency
Grand Circle Travel - numerous countries
AMA Waterways - USA-based
Grupo DouroAzul - voyages along the Douro River in Portugal; at upper right of page, select UK flag for english version of website
Avalon Waterways - Danube, Rhine, Main, Moselle, Seine, Rhône & Saône
River Cruise Line - UK-based agency