Asymptote is a powerful descriptive vector graphics language that provides a natural coordinate-based framework for technical drawing. Labels and equations are typeset with LaTeX, for high-quality PostScript output.
"Academic literature should be freely available: developing countries need access; part time ... thinkers ... journalists and the public can benefit; ... you’ve already paid for much of this stuff with your taxes ... important new ideas from humanity"
EndnoteWeb, RefWorks, Connotea, CiteULike, Zotero, Mendeley. Nice summary of the state of the art by Martin Fenner. Conclusion - not much to choose in some ways - personal preference!
S. Lawrence, K. Bollacker, and C. Giles. Proceedings of the eighth international conference on Information and knowledge management, page 139--146. New York, NY, USA, ACM, (1999)
A. SAKA, and M. IGAMI. IV '07: Proceedings of the 11th International Conference Information Visualization, page 453--458. Washington, DC, USA, IEEE Computer Society, (2007)
C. Wang, J. Han, Y. Jia, J. Tang, D. Zhang, Y. Yu, and J. Guo. Proceedings of the 16th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 203--212. New York, NY, USA, ACM, (2010)