以下是可以免费下载PS AI等设计软件的网站：

1. Adobe Creative Cloud：https://www.adobe.com/creativecloud/plans.html
2. FreeDesignClub：https://freedesignclub.com/
3. Softpedia：http://www.softpedia.com/free-downloads-editors_17-0-0-p1.html
4. Free Software Downloads：http://www.freesoftwaredownloadsplace4u2enjoy4everandeverandeveragainlolzokaybyebyebyebyenowdontforgettolikethissiteifyoureallylikeditokay?cid=23462