Pure Java Network Tools. Free portable cross-platform. 
Include:
 
01) ICMP-ping, 
02) ICMP-traceroute, 
03) DNS-check resolver, 
04) Parallel Host TCP-scanner, 
05) IP-calculator, 
06) Syslog-server,  
07) Telnet-client, 
08) Local ARP-cache request,
09) Parallel Network Ping-Scanner,
10) Snmp-Get concrete value utility.
11) Parallel ICMP flood utility. 
12) Parallel UDP  flood utility. 
13) TFTP-server.
14) NTP-server.
15) Host TCP-ping.
16) SNMP-MRTG traffic monitor.
17...