BuiltWith - Find out the technology behind websites
RealtyWare - CMS & property database for real estate agents
Competera - Competera is a price tracking tool for performance-oriented eCommerce retail and brands of all sizes worldwide.
Remote Landlord - Property management with lease management & accounting
Kompyte - Track & analyze competitors in real time.
Innago - Innago offers a cloud-based property management platform for landlords with small to midsize property portfolios. Innago is 100% free to use and comes with a long list of affordable features.