Dia is inspired by the commercial Windows program 'Visio', though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.
下載地址：http://projects.gnome.org/dia/
安裝步驟：
1、下載軟件
# wget ftp://ftp.gnome.org/pub/gnome/sources/dia/0.96/dia-0.96.1.tar.bz2
2、安裝dia
# tar jxvf dia-0.96.1.tar.bz2
# cd dia-0.96.1
# ./configure --prefix=/usr/local/software/dia
# make && make install
3、運行dia
