MergeKnob is a Google Workspace™ add-on to merge emails/files from Google Sheets™ by clicking buttons to reduce repetitive work. Current functionality includes Email merge and File merge.
There are 2 major features in MergeKnob now

1.Email Merge: Send customized email in batch from user provided templates
Customize Email template by using data from a Google Sheets™
Materialize actual email and preview before sending
Send emails to your audience in batch
Inline or separate the email sent status
20 Free credits to try out
In App stripe based purchase
Pay as you go
No email sending limit per day
2. File Merge: Generate customized file in batch from user provided templates
Support Google Docs™, Google Sheets™ and Google Slides™ as template
Convert generated file into PDF
Skip headers
3 Free days to try out
In App stripe based purchase
Pay as you go

MergeKnob is the most user friendly and most affordable addon to manage messy data for Google Sheets among other great apps, such as chromebookInventory, Stupeflix, MathType, Doc Appender, Power Tools, PlanbookEdu, Bark, PowerSchool, Nearpod, Super Quiz, Slido, MindMup, Lucidpress, Form Mule, VoiceThread, LumApps, BetterCloud, YAMM, Spanning Backup, Digication, Grackle Docs, Form Ranger, EasyBib, DocuSign eSignature, Drag, Colaboratory, Yet Another Mail Merge ,SketchUp for Schools, Asana, Mailmeteor, GAT+, SysCloud Security, Mindomo, diagrams.net, MindMeister, BrainPOP, Cisco Webex, Kami, Screencastify,  Wrike, Mojo Helpdesk, Kaizena, JoeZoo Express, Backupify, Appsheet, Kabanchi, Timify.me, gPanel, Flubaroo, Hapara Teacher, Form Publisher, Slack, Sketchboard, Smartsheet, Zapier, GQueues, AODocs, Certify'em, Easy Accents, StackEdit, Mavenlink, DocHub, Choice Eliminator, Pixton for Schools, SMART Learning Suite, Pear Deck, Doctopus, EasyBib, LucidChart Diagrams, GoFileDrop, PerformFlow, NoodleTools, Zoom,Text gBlaster, formLimiter, Form Publisher, Awesome Table and more...