Handel Opera Synopses
There are lots of resources at the website of Handel & Hendrix in London, the museum formerly known as the Handel House, but this is likely to be the most useful to singers: a chronological listing of his operas, with a synopsis of each, together with lists of roles, details of first performances and other information regarding sources, patronage, composition history etc.
This promises to develop into a really useful resource for singers and their accompanists who have limited patience with IMSLP's Chrysander editions of Handel's vocal works, tenor clefs and all. Christopher Sokolowski has prepared transposing vocal scores of a number of Handel arias, which are available to purchase, and invites commissions for further additions to his catalogue. His site also includes repertoire lists, and a dramatis personae of many of the singers for whom the roles in the operas and oratorios were written, very useful for anyone looking to expand their Handel repertoire.
Listening Guides to the Works of Johannes Brahms
A work-in-progress, and clearly a labour of love, this site is an excellent starting point for an exploration of Brahms's songs, and his music more generally. As well as analytical listening guides, and brief introductions placing each work in the context of Brahms's development, it also presents texts and translations.