KDEKAlgebra, KDE's scientific calculator that allows you to plot 2D and 3D functions and let's you work with trigonometric functions and derivatives (among many other things), gets featured in Linux Journal:
Jonkman Microblog is a social network, courtesy of SOBAC Microcomputer Services. It runs on GNU social, version 1.2.0-beta5, available under the GNU Affero General Public License.
All Jonkman Microblog content and data are available under the Creative Commons Attribution 3.0 license.