These datasets were created by MUC, the Message Understanding Conference.
The conference was not as important as the work needed to get into the conference. It was novel in that participants had to complete in the task in order to gain admission. The performance measure used in the tasks is F1, the geometric mean of precision and recall.
Table partially taken from 
|Conference||Year||Text Source||Topic (Domain)||Task|
|MUC-1||1987||Mil. reports||Fleet Operations||Open ended|
|MUC-2||1989||Mil. reports||Fleet Operations||Template extraction (1 template; 10 slots)|
|MUC-3||1991||News reports||Terrorist activities in Latin America||Template extraction (1 template; 18 slots)|
|MUC-4||1992||News reports||Terrorist activities in Latin America
Additional details can be found here
|Template extraction (1 template; 24 slots)|
|MUC-5||1993||News reports||Corporate Joint Ventures, Microelectronic production||Template extraction (11 templates; 47 slots total) Some templates were nested. Note: Only multilingual MUC; also in Japanese.|
|MUC-6||1995||News reports||Negotiation of Labor Disputes and Corporate Management Succession||Named entity extraction, Coreference, Template element (this was mainly person and organization), Scenario template|
|MUC-7||1997||News reports||Airplane crashes, and Rocket/Missile Launches||Named entity extraction, Coreference, Template elements, Facts or Template relations, Events|
MUC-7: overview of results