you may already know but there are still students who dont know these:useful websites for undergraduate students....mathisfun.com ,hyperphysics.com ,homofaciens.com ,dragonflyeducation,qura.com,brilliant.com,ted.com, utube channels -veritasium veritasium 2, khanacademy, numberphile ,engineering explained,eric the car guy,ted, minutephysic, scischow


*popular search tags: how to ... why... what is.....?.engineeringdesign.....also search anything in google images+blogs

science journals :scribd

*3dsoftwares:creo,ansys,catio you can learn them from youtube tutorials and from the corresponding websites

*use torrents for downloading free books etc
               just share if you wish