
Description: Free SNMP Agent Simulator is an open source tool that allows you to simulate SNMP agents on your network for testing purposes. It supports SNMP v1, v2c, and v3 and can respond to SNMP requests as if it were a real networked device.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: GNS3 is an open source network software emulator that allows users to simulate complex networks and create virtual networks on their computer. It supports emulation of a variety of network devices and topologies.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API