Accordance’s Greek starter package is on sale again. In an earlier post, I explained why it’s a great deal. If you read your GNT regularly and have never ventured into Bible software, this is the best place to start.
For $65 you get a tagged version of NA28 (no apparatus), a solid concise Greek-English dictionary, the best one-volume Bible dictionary, and a one-volume commentary.
This will allow you to continue your reading no matter if you have your print GNT with you or not — whether on your laptop, phone, or tablet.