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HitCounterManager
Free Hit Counter / Death Counter that is running in the background, so you can focus on your stream. No need to keep any windows open for a window capture any more. Initially designed for Dark Souls and similar games but supports any game.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Pretty out-of-the-box solution, but you could download the Hit Counter Manager a program whose main purpose is to help you keep track of how many hits you have taken. Expect that is has a built in timer as well, so you just basically turn off everything related to actually keep tracking of hits and just use it as a secondary live split, you click on "turn on timer" and then never turn it off.
maybe you could try using livesplit installed and another in your browser here: https://one.livesplit.org/