Custom internal tools built entirely inside Google Workspace, for teams that do not want another subscription.
I build with Apps Script, Sheets, Drive, Gmail and Google Sites: operational dashboards, custom web apps served from Sheets data, automated messaging systems, form driven workflows, scheduled jobs, geographic and mapping tools, and reporting that assembles itself.
A representative build: a live command center and lead mapping system for a marketing agency's account team. Apps Script services covering geographic lead data, a service area verdict engine with client family logic, a KMZ coverage boundary importer, a browser based lead map, and a sixth generation operations dashboard. It went into production and stayed there. Cache warming and query optimisation cut page load from between ninety and one hundred sixty seconds down to between fifteen and thirty. Capacity was expanded past twenty thousand rows per tab. Appointment setters finally had coverage visibility before they dialled, which was the entire point.
A second one: I run a nonprofit's whole member communication system inside Apps Script and Gmail. Monthly HTML newsletter, automated registration notices, retention surveys feeding straight into board reporting. Compliant with Canadian anti spam law, running inside the organisation's own Workspace, with no third party vendor and no per member fee.
If your data already lives in Sheets, you probably do not need a new platform. You need someone who can build properly on the one you have.