diff --git a/Cask b/Cask
index 78a06513f..7e6bfea39 100644
--- a/Cask
+++ b/Cask
@@ -112,7 +112,10 @@
 (depends-on "quickrun")
 (depends-on "repl-toggle")
 
-;; Workgroups --- core/core-workgroups.el
+;; Debugging -- core/core-debug.el
+(depends-on "realgud")
+
+;; Sessions --- core/core-sessions.el
 (depends-on "workgroups2")
 
 
diff --git a/core/core-debug.el b/core/core-debug.el
new file mode 100644
index 000000000..da5faeebb
--- /dev/null
+++ b/core/core-debug.el
@@ -0,0 +1,39 @@
+;;; core-debug.el
+
+(after! debug
+  ;; For elisp debugging
+  (map! :map debugger-mode-map
+        :n "RET" 'debug-help-follow
+        :n "n" 'debugger-step-through
+        :n "c" 'debugger-continue))
+
+(use-package realgud
+  :commands (realgud:gdb realgud:trepanjs realgud:bashdb realgud:zshdb)
+  :config
+  (map! :map realgud:shortkey-mode-map
+        :n "j" 'evil-next-line
+        :n "k" 'evil-previous-line
+        :n "h" 'evil-backward-char
+        :n "l" 'evil-forward-char
+        :m "n" 'realgud:cmd-next
+        :m "b" 'realgud:cmd-break
+        :m "B" 'realgud:cmd-clear
+        :n "c" 'realgud:cmd-continue)
+
+  ;; Temporary Ex commands for the debugger
+  ;; TODO Turn temporary ex commands into macro
+  (defun narf*debug-init (&rest _)
+    (exmap "n[ext]"   'realgud:cmd-next)
+    (exmap "s[tep]"   'realgud:cmd-step)
+    (exmap "b[reak]"  'narf:debug-toggle-breakpoint)
+    (exmap "c[ontinue]" 'realgud:cmd-continue))
+  (defun narf*debug-quit (&rest _)
+    (narf/evil-ex-undefine-cmd "n[ext]")
+    (narf/evil-ex-undefine-cmd "s[tep]")
+    (narf/evil-ex-undefine-cmd "b[reak]")
+    (narf/evil-ex-undefine-cmd "c[ontinue]"))
+  (advice-add 'realgud-cmdbuf-init :after 'narf*debug-init)
+  (advice-add 'realgud:cmd-quit :after 'narf*debug-quit))
+
+(provide 'core-debug)
+;;; core-debug.el ends here
diff --git a/core/core-popup.el b/core/core-popup.el
index b328b85aa..1f76b6ce2 100644
--- a/core/core-popup.el
+++ b/core/core-popup.el
@@ -10,7 +10,11 @@
   :config
   (shackle-mode 1)
   (setq shackle-rules
-        '(;; Plugins
+        '(;; Debuggers
+          ("\\`\\*\\(g\\|zsh\\|bash\\)db.*?\\*\\'" :regexp t :align below :size 20)
+          ("\\`\\*trepanjs.*?\\*\\'" :regexp t :align below :size 20)
+
+          ;; Plugins
           ("*helm bookmarks*"                :align below  :size 7 :select t)
           ("\\` ?\\*[hH]elm.*?\\*\\'" :regexp t :align below  :size 20 :select t)
           (" ?\\*Flycheck.+\\*"       :regexp t :align below  :size 15  :noselect t)
@@ -210,6 +214,37 @@
           "q" 'narf/org-agenda-quit
           "Q" 'narf/org-agenda-quit))
 
+  (after! realgud
+    ;; This allows realgud debuggers to run in a popup.
+    ;; TODO Find a more elegant advice-based solution
+    ;; FIXME Causes realgud:cmd-* to focus popup on every invocation
+    (defun realgud:run-process(debugger-name script-filename cmd-args minibuffer-history &optional no-reset)
+      (let ((cmd-buf))
+        (setq cmd-buf
+              (apply 'realgud-exec-shell debugger-name script-filename
+                     (car cmd-args) no-reset (cdr cmd-args)))
+        (let ((process (get-buffer-process cmd-buf)))
+          (if (and process (eq 'run (process-status process)))
+              (progn
+                (pop-to-buffer cmd-buf)
+                (define-key evil-emacs-state-local-map (kbd "ESC ESC") 'narf/debug-quit)
+                (realgud:track-set-debugger debugger-name)
+                (realgud-cmdbuf-info-in-debugger?= 't)
+                (realgud-cmdbuf-info-cmd-args= cmd-args)
+                (when cmd-buf
+                  (switch-to-buffer cmd-buf)
+                  (when realgud-cmdbuf-info
+                    (let* ((info realgud-cmdbuf-info)
+                           (cmd-args (realgud-cmdbuf-info-cmd-args info))
+                           (cmd-str  (mapconcat 'identity  cmd-args " ")))
+                      (set minibuffer-history
+                           (list-utils-uniq (cons cmd-str (eval minibuffer-history))))))))
+            ;; else
+            (progn
+              (if cmd-buf (switch-to-buffer cmd-buf))
+              (message "Error running command: %s" (mapconcat 'identity cmd-args " ")))))
+        cmd-buf)))
+
   (after! flycheck
     (map! :map flycheck-error-list-mode-map
           :n "q" 'narf/popup-close
diff --git a/core/defuns/defuns-debug.el b/core/defuns/defuns-debug.el
index 18ac637a8..3f981ff0a 100644
--- a/core/defuns/defuns-debug.el
+++ b/core/defuns/defuns-debug.el
@@ -35,5 +35,40 @@
   (let (message-log-max)
     (message "%s%s" (if bang ">> " "") message)))
 
+;;;###autoload (autoload 'narf:debug "defuns-debug" nil t)
+(evil-define-command narf:debug (&optional path)
+  "Initiate debugger for current major mode"
+  (interactive "<f>")
+  (let ((default-directory (narf/project-root)))
+    (cond ((memq major-mode '(c-mode c++-mode))
+           (realgud:gdb (if path (concat "gdb " path))))
+          ((memq major-mode '(ruby-mode enh-ruby-mode))
+           (narf:repl nil (format "run '%s'" (f-filename (or path buffer-file-name)))))
+          ((eq major-mode 'sh-mode)
+           (let ((shell sh-shell))
+             (when (string= shell "sh")
+               (setq shell "bash"))
+             (cond ((string= shell "bash")
+                    (realgud:bashdb (if path (concat "bashdb " path))))
+                   ((string= shell "zsh")
+                    (realgud:zshdb (if path (concat "zshdb " path))))
+                   (t (user-error "No shell debugger for %s" shell)))))
+          ;; TODO Add python debugging
+          ((memq major-mode '(js-mode js2-mode js3-mode))
+           (realgud:trepanjs))
+          (t (user-error "No debugger for %s" major-mode)))))
+
+;;;###autoload (autoload 'narf:debug-toggle-breakpoint "defuns-debug" nil t)
+(evil-define-command narf:debug-toggle-breakpoint (&optional bang)
+  (interactive "<!>")
+  (call-interactively (if bang 'realgud:cmd-clear 'realgud:cmd-break)))
+
+;;;###autoload
+(defun narf/debug-quit ()
+  (interactive)
+  (ignore-errors (call-interactively 'realgud:cmd-quit))
+  (narf/popup-close)
+  (evil-normal-state))
+
 (provide 'defuns-debug)
 ;;; defuns-debug.el ends here
diff --git a/core/defuns/defuns-evil.el b/core/defuns/defuns-evil.el
index f71062abc..9f94250bb 100644
--- a/core/defuns/defuns-evil.el
+++ b/core/defuns/defuns-evil.el
@@ -125,5 +125,14 @@
       (user-error
        (evil-ex-pattern-update-ex-info nil (format "?%s" lossage))))))
 
+;;;###autoload
+(defun narf/evil-ex-undefine-cmd (cmd)
+  (if (string-match "^[^][]*\\(\\[\\(.*\\)\\]\\)[^][]*$" cmd)
+      (let ((abbrev (replace-match "" nil t cmd 1))
+            (full (replace-match "\\2" nil nil cmd 1)))
+        (setq evil-ex-commands (delq (assoc full evil-ex-commands) evil-ex-commands))
+        (setq evil-ex-commands (delq (assoc abbrev evil-ex-commands) evil-ex-commands)))
+    (setq evil-ex-commands (delq (assoc cmd evil-ex-commands) evil-ex-commands))))
+
 (provide 'defuns-evil)
 ;;; defuns-evil.el ends here
diff --git a/init.el b/init.el
index 4f6e45f78..6179babef 100644
--- a/init.el
+++ b/init.el
@@ -61,6 +61,7 @@
         core-vcs             ; remember remember, that commit in November
         core-helm            ; a search engine for life and love
         core-eval            ; run code, run.
+        core-debug           ; emacs as a universal debugger
         core-sessions        ; cure Emacs alzheimers + tab emulation
 
         ;; Environments
diff --git a/private/my-commands.el b/private/my-commands.el
index 3977ddc36..a56fd04bc 100644
--- a/private/my-commands.el
+++ b/private/my-commands.el
@@ -79,5 +79,8 @@
 (after! flycheck
   (exmap "er[rors]"    (λ! (flycheck-buffer) (flycheck-list-errors))))
 
+;; Debuggers
+(exmap "debug"    'narf:debug)
+
 (provide 'my-commands)
 ;;; my-commands.el ends here