LOOP software for hydraulic modelling of pressurised looped networks for water supply distribution.
The software was written in an attempt to help developing countries to plan and design water distribution systems that are better suited to their needs. The development was supported financially by the World Bank and the UNDP Inter-regional Project.
LOOP 4.0 can handles up to 1000 pipes and can simulate up to 10 nodes with known hydraulic grade lines. This software is widely used in India for design and simulation of water supply networks.

We are getting lot of queries from where to download the LOOP software. The software as available in public domain is provided in freebies section of this website for free download.