Software Defined Networking:

MININET: A Virtual Network on Laptop (or other PC). Mininet creates a realistic virtual network, running real kernel, switch and application code, on a single machine (VM, cloud or native).

Web Archiving Tools:
Warrick, an open source downloadable tool or web service for reconstructing websites from web archives, using Memento, Wget, an open source file retrieval utility, Heritrix, an open source, extensible, web-scale, archival quality web, HTTrack, an open source website copying utility

Qualnet: Network simulator for Wimax Network.

Cisco Packettracer: Network simulator from Cisco for general network design and study.

Open Source Sotwares:
Wireshark, wget, VirtualBox, OpenStack etc.

Pluribus Networks S68 Data Center Server Switch:
The S68 is a Top-Of-the-Rack (TOR) server-switch combines low latency L2/L3 switching with network virtualization and security features that scale to fabrics of up to 16 million hosts. The switch is ideally suited for virtualized data centers and software-defined networking (SDN). The additional server-class CPU and SSD storage provide a platform to run SDN and cloud orchestration controllers directly in the network