Python：https://www.python.org
VMware Free Software: http: //www.onlinedown.net/soft/2062.htm
Ubuntu：https://www.ubuntu.com/download/alternative-downloads
navicat 12 for mysql RI: http: //www.ddooo.com/softdown/129462.htm
MySQL：https://dev.mysql.com/downloads/mysql/
pycharm：https://www.jetbrains.com/pycharm/download/download-thanks.html?platform=windows&code=PCC
pip：https://pypi.org/project/pip/#files
jquery:http://jquery.com/download/
jquery.cookie.js:http://plugins.jquery.com/cookie/
Source codes django checkcode.py: http://files.cnblogs.com/files/wupeiqi/CheckCode.zip