* xclip     https://github.com/astrand/xclip
* stardict  http://www.huzheng.org/stardict/
* rofi      https://github.com/DaveDavenport/rofi
* prince    https://www.princexml.com/
* unoconv   https://github.com/dagwieers/unoconv
* texi2html http://www.nongnu.org/texi2html/
* ddjvu     http://djvu.sourceforge.net/doc/man/ddjvu.html
* pandoc    http://pandoc.org