Wikipedia
AngelList
AngelList is a U.S. website for startups, angel investors, and job-seekers looking to work at startups. The platform has a mission to democratize the investment process. It started as an online introduction board for tech startups that needed seed funding. Now, the site allows startups to raise money from angel investors free of charge.
AngelList syndicates allow investors to invite other accredited investors to share in the deals.