I would like to find out if there are more other useful softwares with the same functions or more like TCPREPLAY which has the ability to "playback" PCAP files? Thanks for your suggestions!
Just about any program that uses the libpcap library can replay pcap files, assuming by "replay" you mean "re-use saved network traffic" rather than "put that traffic back on the network".
If, on the other hand, you're looking at injecting the network traffic back onto the network, then your options are much more limited. There's