Resources for Sentiment Analysis and Opinion Mining
Corpus for quality estimation of machine translation of product reviews (2015).
The corpus and additional information is available here.
Resources for Biomedical and Chemical Text Mining
RAMBO 800+: A Corpus for the Development of Gene/Protein Recognition from Rare and Ambiguous Abbreviations (2014).
I am not an author of this data set, but it has been generated in the course of the research published in a paper I co-authored, please cite this paper
Corpus of Medline abstracts annotated with chemical entities (2008).
please cite this paper
(Original data location