OpenDeck 2.14.2
Configure an Elgato Stream Deck with custom actions, profiles and compatible Stream Deck plugins using OpenDeck, a free, open-source controller app for Windows.
Utilities
Practical software for managing files, maintaining your system and getting everyday tasks done.
Browse by platform and category
View details
OpenedFilesView 1.91
Find which process holds a file open with OpenedFilesView, a free Windows utility for investigating sharing violations. Administrator rights are required; Windows 10/11 with Secure Boot enabled is unsupported.
OpenEXR Viewer 0.6.1
Inspect OpenEXR image layers and detailed file metadata with a free, open-source viewer. This download is the Windows 64-bit installer.
OpenHashTab 3.1.1
Calculate and compare file checksums from Windows file properties with OpenHashTab, a free, open-source shell extension with checksum-file checking and export tools.
OpenRocket 24.12
Design model rockets, compare motor configurations and plot simulated flights with OpenRocket for Mac. This download is the Apple Silicon package.
OpenRocket 24.12
Design model rockets and compare simulated flights with OpenRocket, a free, open-source tool with component libraries, stability analysis and flight plots.
opentrack 2026.1.0
Track head movements and send them to compatible games and flight simulators with opentrack for Windows, using webcam, marker or other supported tracking inputs.
OpenVPN 2.7.8 (I002 Windows installer)
Connect a Windows PC to a configured VPN with OpenVPN Community Edition, including the OpenVPN GUI tray client and a system service.
OpenWebStart 1.14.0
Run JNLP-based Java applications on Windows with OpenWebStart, a free, open-source Java Web Start replacement with JVM management and graphical settings.
OpenWithView 1.11
Hide unused applications from the Windows Open With dialog and restore them when needed with NirSoft's portable freeware utility.
Opera Air 137.0.6036.91
Browse the web with a minimalist interface, built-in soundscapes and guided breaks in Opera Air, a free browser for Windows.
Opera Browser
Browse the web with built-in ad blocking, sidebar messengers and tab organization in Opera, a free browser for Windows.
Opera Browser 139.0.6053.15
Browse the web on Mac with grouped tabs, sidebar messaging, an ad blocker and a built-in browser VPN. This entry links to Opera's macOS DMG package.
Opera Browser 103.1.5234.90883
Browse the web on Android with a built-in ad blocker, free browser VPN, data-saving mode and pages saved for offline reading.
Oracle VirtualBox 7.2.22
Run guest operating systems in virtual machines on your Windows PC with Oracle VirtualBox. Use snapshots to revisit configurations and manage VMs through a graphical interface or command line.
OSFMount 3.3.1000
Mount disk images as Windows drives or create temporary RAM disks with OSFMount, a free 64-bit utility from PassMark Software.
OSForensics 11.1 build 1017
Search files and emails, examine recent Windows activity and organize digital evidence with PassMark OSForensics. A limited Free edition and paid editions are available.
Outlook CalDav Synchronizer 4.7.1
Sync Outlook calendars, tasks and contacts with CalDAV and CardDAV servers using this free, open-source Windows Outlook add-in.
OutlookAttachView 3.55
Find attachments across Outlook messages and save selected files to a folder with OutlookAttachView, a free Windows utility for Microsoft Outlook.
OverKeys 0.3.5
Keep an alternative keyboard layout visible while you type on Windows. OverKeys provides a customizable overlay for Colemak, Dvorak, Canary and other layouts.
OverSight 2.4.0
Monitor microphone and webcam activity on your Mac with OverSight, a free, open-source utility that alerts you when a device is activated and can identify the process using it.
OVITO Basic 3.17.1
Inspect particle simulations and molecular structures in 3D with OVITO Basic, a free Windows application for visualization and pipeline-based data analysis.
Pacifist 4.1.5
Inspect macOS installer packages, disk images and archives, then extract individual files with Pacifist for Mac.
PaperCut Mobility Print
Share Windows-hosted printers with personal devices using PaperCut Mobility Print, a free BYOD printing server for IT administrators. Cloud Print adds remote printing for Windows, Mac and Chromebook users.