46 Research APIs: DataUnison, Mendeley, LexisNexis and Zotero by Wendell Santos.
From the post:
Our API directory now includes 46 research APIs. The newest is the Globus Online Transfer API. The most popular, in terms of mashups, is the Mendeley API. We list 3 Mendeley mashups. Below you’ll find some more stats from the directory, including the entire list of research APIs.
I did see an API that accepts Greek strings and returns Latin transliteration. Oh, doesn’t interest you.
There are a number of bibliography, search and related tools.
I am sure you will find something to enhance an academic application of topic maps.