Arduino Serial Monitor

Is there a program or software that allows me to send serial command without pressing the send button every time?

Yes, literally thousands of them. You should indicate which OS you're using.

windows 8

puTTY works on most operating systems

...R

Robin2:
puTTY works on most operating systems

...R

PuTTY works great, but it is pretty annoying to send a CR+LF on a serial command: CTRL+J

I use PuTTY to debug my Bluetooth projects: I connect to the Arduino using Serial Monitor and to its bluetooth module using PuTTY, all from the same PC.

AlxDroidDev:
PuTTY works great, but it is pretty annoying to send a CR+LF on a serial command: CTRL+J

So don't send CR LF ?

Another alternative is for the OP to write his own PC program to do the sending - perhaps using Python or Visual Basic

...R