In wastewater treatment domain it is developed a number of simulators used for treatment processes modelling, focused on solving different problems such as: treatment processes control, the improvement of wastewater treatment plants operating, plant costs reduction, etc. In this paper there are presented different simulators used for treatment processes modelling, such as: BW Controller, EFOR, GPS-X, SIMBA, STOAT and WEST. It is also achieved an analysis where are presented the main features, models and control types used by each simulator. The goal of this paper is to highlight the simulators utility and main facilities (features, models, etc.) that recommend theirs usage in wastewater treatment process modelling.