Y Combinator (also known as YC) is a US-based seed accelerator, which was started in March 2005.
Fifty Years is a venture capital seed fund based in San Francisco, California founded by Seth Bannon and Ela Madej in 2016 and focuses on investing in the impact technology market.
Hack VC is a venture capital firm focused on early-stage investments
V1.VC is a seed stage venture capital and private equity firm.
Investment fund run by Chris Sacca that supersedes the original Lowercase Capital, it is focused on investments that attempt to protect the environment and reduce human/animal suffering.
Oyster Ventures invests in new-frontier technology companies.