Angry IP Scanner is a fast, simple cross-platform scanner written in Java. It is not as deep as Nmap, but it is excellent for a quick sweep on a flat network when you just need to know "what is alive on this /24 and on which ports?".
Strengths:
- Multithreaded — scans a Class C in seconds.
- Plugin-extensible (NetBIOS info, MAC vendor lookup, HTTP titles).
- Exports CSV, TXT, XML, IP-Port list — easy to feed into a spreadsheet or a SIEM.