for industrial IP cameras, mostly comes with its own client software, and generally for fee, can handle hundreds of cameras, so the software is not the problem.
Are you planned to install D1 standard definition IP cameras or HD Megapixels IP cameras? You can consider to use IP-SAN system for storage and management.
GuiadoCFTV
Tecnologia, Sistemas de CFTV, Videomonitoramento, IP, Segurança Eletrônica, SES, Redes e Convergência