KeyCastr is described as 'Lets you easily display your keystrokes while recording screencasts' and is a Screen Casting tool in the video & movies category. There are more than 10 alternatives to KeyCastr for Windows, Mac, Linux and Web-based. The best KeyCastr alternative is Keyviz, which is both free and Open Source. Other great apps like KeyCastr are Screenkey, YAKD, Show Me The Key and Carnac.
Keyviz is a free and open-source tool to visualize your keystrokes and mouse actions in real-time.
Keyviz is the most popular Windows, Mac & Linux alternative to KeyCastr.
Keyviz is the most popular Open Source & free alternative to KeyCastr.
Screenkey is a screencast tool to display your keys inspired by Screenflick for Mac OS and based initially on Key-mon project.
YAKD (Yet Another Key Displayer) is a lightweight, open-source Windows tool for displaying keyboard and mouse button presses on-screen, typically for use with screen recording and screen-casting. RTSS Rivatuner Statistics Server is supported.
Show keys you typed on screen, so your audiences can see what you do clearly while you are streaming or recording.
KeyFX is a screencast and presentation utility that allows you to highlight the mouse cursor and visualize your keystrokes.
KeyFX is the most popular commercial alternative to KeyCastr.
KeyPress OSD is a full-featured screencasting tool for displaying key-presses on Windows. Beyond on-screen keypress display, it features text-expansion, mouse-highlighting and a multi-clipboard manager.
KeyScreen makes your keystrokes visible on screen-perfect for tutorials, presentations, and screen recordings.
Floating widget shows each key pressed in real time and highlights the cursor with fully adjustable design. Choose from 10+ styles, unlimited color themes, and over 10 sound options. Works across multiple screens for screen recording on Windows and macOS.
Mouseposé is the indispensible mouse pointer highlighting tool (aka "virtual laserpointer") for everyone doing demos at tradeshows, presentations and trainings, or those individuals with huge and high resolution displays.
A Little utility that implements a global key logger which displays all shortcuts & keystrokes as you type on screen and with a semi-transparent overlay. This makes it very easy to show any shortcuts you use if you for example record a software demo.
A utility to show keyboard keys visually on the Windows screen. - KaustubhPatange/Kling
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My favourite alternative to KeyCastr for Windows. I like it for it's simplicity and minimal config to get started.