iShowU HD Alternatives for Windows
iShowU HD is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The most popular Windows alternative is 
Camtasia Studio. It's not free, so if you're looking for a free alternative, you could try 
VokoscreenNG or 
CamStudio. If that doesn't suit you, our users have ranked more than 50 alternatives to iShowU HD and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to iShowU HD are 
ActivePresenter (Freemium), 
Loom (Freemium), 
oCam (Free Personal) and 
Wink (Free).
- All-in-one screen and webcam recording and video editing software with a simple but powerful workflow. View 182 alternatives to Camtasia Studio
- VokscreenNG is a user friendly screencaster for Linux and Windows. View 126 alternatives to VokoscreenNG
- Record your computer screen with audio input from Mic or Speakers. Also shows mouse clicks in addition to the regular cursor. View 121 alternatives to CamStudio
Discontinued
The project seems to be no longer developed. Last version, 2.7 r316, released in May 2015, can be still downloaded from SourceForge.
Warning
As described on VirusTotal comment (https://www.virustotal.com/en/file/1ddb733efb11769a05cc735d555e9a4df92c4cdf29fa47ea3864e57e67dcf884/analysis/1411383540/): if you download CamStudio from SourceForge.net, the VirusTotal results are 0/53. After installing this SF version, it immediately says that there is an update available. When the link is clicked, it takes you to camstudio.org, which has a zip file that, scanned with VirusTotal, gives you 15/53 result. So do NOT download and install the "update": it's a malware. Installer as of 09/22/2014.
- Free • Open Source
- Windows
- PortableApps.com
- ActivePresenter is a solution for creating screencast videos, handouts, manuals, documentation, and interactive training presentations. View 96 alternatives to ActivePresenter
- Freemium • Proprietary
- Mac
- Windows
- Easy and free screen recorder for Mac, Windows, and Chromebooks. Record your camera and screen with audio directly from your Chrome browser and share the video with your team, friends, and family. View 138 alternatives to Loom
- oCam is very simple and easy "Screen Recorder" and "Screen Capture". View 95 alternatives to oCam
Bundleware
It installs something called BRTSvc, a known crypto miner. This will use your computer resources and slow your computer down.
- Free Personal • Proprietary
- Windows
- Wink is a Tutorial and Presentation creation software, primarily aimed at creating tutorials on how to use software (like a tutor for MS-Word/Excel etc). View 75 alternatives to Wink
- Debut is a screen capture and video recording software that records videos from your screen, webcam or other video devices. Capture your entire desktop or a selected portion and save the recorded videos as avi, flv, wmv or other video file formats. View 94 alternatives to Debut
- Ashampoo Snap enables you to create high-quality screenshots, videos and demos of your screen content. Edit, save and share your excellent results with others. View 159 alternatives to Ashampoo SnapNo screenshots yet
- Paid • Proprietary
- Windows
- Screen recorder software for making video tutorials, product demos and sharing your gaming experience. Screenbits allows you to easily record anything on the screen and save it into high quality compressed video files. View 107 alternatives to Screenbits