pooler (GitHub user) — cpuminer (open-source project)

cpuminer (often referred to as minerd) is an open-source CPU cryptocurrency miner originally published on GitHub by the user 'pooler'. The project dates back to the early days of altcoin mining (around 2011) and provided a lightweight, command-line miner for SHA-256 and later scrypt-based coins; it became a common reference implementation and a base for many forks.

'pooler' appears to be an individual GitHub maintainer rather than a commercial company. The repository has been widely forked and extended (for example, cpuminer-multi by other maintainers) as GPU and ASIC mining evolved; cpuminer itself remains notable as historical, lightweight CPU-mining software and a common artifact in analyses of mining tools and related software.