How to make a command line executable an application?
Use Automator.


Open Automator and double-click on Application.
In the "Name" search box, type Apple and you should see "Run AppleScript".
Drag "Run AppleScript" into the right-hand window.
Where it says (* Your script goes here *), replace that text with the following code:

tell application "Terminal"
    activate
    do script with command "JMeter"
end tell

File > Save and enter a name, and choose where to save the application.
Double-click on the newly created application.