Autodesk EAGLE
Altium Designer
KiCad
EasyEDA
Fritzing
DipTrace
KiCad EDA
Proteus PCB design
FlexSim
AnyLogic
ns-3
Paessler Multi Server Simulator
IMUNES
NetSim
Cisco VIRL
Mininet
Autodesk EAGLE is recommended for hobbyists, engineers, and small to medium-sized teams involved in electronics design. It is particularly suitable for those who require powerful design tools with a balance between usability and advanced capabilities. While beginners can appreciate its intuitive interface, experienced designers will benefit from its sophisticated features and integration with other Autodesk software.
Altium Designer - PCB Design Software
AnyLogic - AnyLogic has changed simulation modeling and expanded its application into complex business environments. The unmatched flexibility of multimethod modeling allows users to capture the complexity of virtually any system, at any level of detail.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
ns-3 - a discrete-event network simulator for internet systems
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
Paessler Multi Server Simulator - Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.