OSS Capital

OSS Capital is an early-stage venture capital firm founded in 2018 that invests exclusively in commercial open-source software (COSS) companies. The firm backs founders building businesses with open source at their core, at inception and seed stage, and invests globally rather than by geography. Investments are led by Founder and General Partner Joseph Jacks.

The firm's stated objective is to improve capital efficiency for open-source companies and to broaden the adoption of COSS across digital products. Alongside capital, it provides founders with guidance drawn from experienced COSS founders and partners, and network access intended to help companies build and scale. The approach rests on experience across software, investing and startup growth.

Named portfolio companies include Appsmith, Dagster Labs, Cal.com, NocoDB and Wasmer - a group spanning developer tooling, internal application builders, scheduling and infrastructure, all of which distribute open-source software as the core of a commercial product. That concentration reflects the firm's singular thesis rather than a diversified sector mandate.

For professionals, the practical characteristics of the firm are a narrow investment focus (commercial open-source software), a concentrated stage (inception and seed), and a small set of decision-makers with direct founder engagement.