Hi everyone,
There are some feature updates for Graph Galaxy since the last Show and Tell.
Now Graph Galaxy comes with a DOT editor that supports live preview:
The editor highlights the code based on syntax. It’s a native implementation, and works for dark mode 
Graph Galaxy 9.0 gets released just now, and it comes with another interesting feature - support to create image nodes by dragging images into the canvas in visual editor:
Welcome to give it a try and let me know for any feedback.
Attached 10 Promo Codes for redeeming if you are going to use the app after free-trial period:
KRKL6PYE46XH AT33H6HJJRP9 HTMJR3PT6A37 PWPJJP79LWAE 333RJ3M47FWF TME7LKHA6EFR HFHRLWNENWTK M3YWEEKWXH7A FFXHJJTAKXR4 HWJ77LMYAXM3
Also see How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support for how to redeem the gift.
Please reply the redeemed ones so I can mark them unavailable, and feel free to ask me (reply this thread or message me privately) for Promo Codes in case all of them are redeemed.
Thanks,