Rudolph is possibly one of the best hackers of DS stuff out there and has been involved in everything from hacking sakura to run on different carts, writing DLDI patches, making tools that later became the de facto tools to run the 3 in 1 and various other expansion packs on different carts, highly polished rom dumpers (DLDI, FTP and 3 in 1 and saves as you have seen) to general information and hacking games. Secondly you asked us so I do not quite understand your reluctance.
SavSendReceive is a frontend to the savsender. It just provides a nice frontend for the last stages and as you are probably using your internal network it is worth trying it out without fiddling with router settings (most I have ever seen have few or no limits on internal stuff).
rein, rain and reinmoon are for GBA slot/slot 2 carts and they are limited in what they can run on even then (they were pre DLDI for the most part and not wishing to bring back memories I shall not elaborate).