Kindit.org is a social networking platform for non-profit. Here various non-profits orgonizations. can publish there profile as group. and create various Events.   people  willing to volunteer or donate shall brouse the Event. and...

visit site : http://www.abixer.com Abixer application was created by a group of engineering students to help you and your fellow classmates and students better understand and share the concepts, ideas and knowledge of math, science,...

https://onelaboratory.org/ OneLab is a web based platform designed to enable RAPID dissemination of scientific findings, foster OPEN peer commentary and promote COLLABORATION .