Course Sites
Most of the university course sites and teaching-focused pages are not public these days, but you can see some exceptions below (some rather old).
Edwin Duncan (Towson University) [see 'English 425 - Chaucer', 'English 451 - History of the English Language' and 'English 475 - Old English']
Suzanne Kemmer (Rice University), 'Words in English: Structure, History, Use' [Dr Kemmer has a number of other HEL teaching pages: 'The History of English', 'Spelling and Standardization in English: Historical Overview', 'Chronology of Events in the History of English', 'A Brief History of English, with Chronology', 'Loanwords: Major Periods of Borrowing in the History of English']
Carol Percy (University of Toronto), History of the English Language ['a list of links to on-line, worldwide resources for the study of the English language and its history'; the older version is available here]
Daniel Donoghue (Harvard University), History of the English Language Workbook: Supplementary Exercises [the previous version is available here; see also Harvard University Library's study guide for this course]
Peter Tan (National University of Singapore), 'E2111: Historical Variation in English'
David Sprunger (Concordia College), 'ENG 315; The English Language: Historical and Analytical' [Note: last updated in 2006]
Stephen J. Harris (University of Massachusetts, Amherst) [includes 'Old English pages at UMass']
Eric Weiskott (Boston College), 'Middle English Alliterative Poetry' [poems, pronunciation, metre, manuscripts, timeline]
Cynthia Turner Camp (University of Georgia) ['a wide array of resources -- mostly digital, but some crucial print ones -- for the study of Middle English culture, language, and literature']