I regularly write scientific papers and create presentations for my PhD thesis, and all I need for that are LyX and Inkscape. To keep on track and stay focused, I out-source my brain, managing my knowledge and research ideas in Freeplane.
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for Ubuntu users and developers
Q&A for power users of web applications
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Q&A for professional system and network administrators
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Stack Exchange Network staging zone, where users come together to build new Q&A sites