Execute babel source code blocks with eval-in-repl.

• Async execution (because it uses an external process!)
• Babel execution without the output written in the buffer (Less visual distraction! Output is reproducible as long as the code is saved)

Available via MELPA (Set up MELPA if you haven't already). Run

M-x package-install RET org-babel-eval-in-repl RET

No keybindings are provided by default (because I couldn't find one that's appropriate). Create your own comfortable keybind for execution. Here's my case:

(with-eval-after-load "ob"
  (require 'org-babel-eval-in-repl)
  (define-key org-mode-map (kbd "C-<return>") 'ober-eval-in-repl)
  (define-key org-mode-map (kbd "M-<return>") 'ober-eval-block-in-repl))

See the wiki for more usage (you can find more practical keybindings)

(This prevents the cursor to jump to the repl buffer after execution. I was more comfortable with this)

(with-eval-after-load "eval-in-repl"
  (setq eir-jump-after-eval nil))

#+BEGIN_SRC ruby
p "Test"
#+END_SRC

Press C-<return> on the source code.

Check out here for a list of contributors.