IPE 7
IPE 7 is the current version of IPE. The core graphics functionality has been separated into a library libipe. The frontend is now written in Lua and includes powerful and well-documented plugin system. Plugins can be written in Lua or C++. New features include support for clipping paths, gradients, transparency and tiling patterns. Binaries are available for Windows as well as for some Linux distribution. The OS/X Ipe.app bundle (since version 7.1.1) can be built and shared but is not officially maintained by Otfried Cheong (see the Ipe7 wiki site).
Read more about this topic: Ipe (program)