JRE 8 deploy.jar is the JAR file for JRE 8 Java Control Panel and other deploy tools. JRE (Java Runtime) 8 is the runtime environment included in JDK 8.

JRE 8 deploy.jar contains Java classes to support different JRE tool commands:

com.oracle.deploy.update.Updater - Keeps JRE updated. 
com.sun.deploy.panel.ControlPanel - Supports the "java" control panel.
com.sun.deploy.jardiff.JarDiff - Compares two JAR files.
com.sun.deploy.cache.CacheUpgrader - Caches upgrade information.
com.sun.deploy.ClientContainer - Client side container.
com.sun.deploy.net.cookie.GenericCookieHandler - Manages cookies related to JRE updates.
com.sun.deploy.panel.JreLocator - Finds installed JRE environments.

Here is the list of Java classes in JRE 1.8.0_191 deploy.jar located at \fyicenter\jdk-1.8.0_191\jre\lib\deploy.jar.

Package Content:

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com/sun/deploy/uitoolkit/Applet2Adapter.class
com/sun/deploy/uitoolkit/SynthesizedEventListener.class
com/sun/deploy/uitoolkit/ToolkitStore.class
com/sun/deploy/uitoolkit/UIToolkit.class
com/sun/deploy/uitoolkit/Window.class
com/sun/deploy/uitoolkit/WindowFactory.class
com/sun/deploy/uitoolkit/impl/awt/AWTAppContext.class
com/sun/deploy/uitoolkit/impl/awt/AWTFrameWindow.class
com/sun/deploy/uitoolkit/impl/awt/AWTWindowFactory.class
com/sun/deploy/uitoolkit/impl/awt/AppletCompatibleHost.class
com/sun/deploy/uitoolkit/impl/awt/OldPluginAWTUtil.class
com/sun/deploy/uitoolkit/impl/awt/UIToolkitImpl.class
com/sun/deploy/uitoolkit/impl/awt/ui/AWTDialog.class
com/sun/deploy/uitoolkit/impl/awt/ui/DownloadWindow.class
com/sun/deploy/uitoolkit/impl/awt/ui/FileFilterImpl.class
com/sun/deploy/uitoolkit/impl/awt/ui/SwingConsoleWindow.class
com/sun/deploy/uitoolkit/impl/awt/ui/UIFactoryImpl.class
com/sun/deploy/uitoolkit/impl/text/FXAppContext.class
com/sun/deploy/uitoolkit/impl/text/TextAppletAdapter.class
com/sun/deploy/uitoolkit/impl/text/TextConsoleWindow.class
com/sun/deploy/uitoolkit/impl/text/TextPreloader.class
com/sun/deploy/uitoolkit/impl/text/TextUIFactory.class
com/sun/deploy/uitoolkit/impl/text/TextUIToolkit.class
com/sun/deploy/uitoolkit/impl/text/TextWindow.class
com/sun/deploy/uitoolkit/impl/text/TextWindowFactory.class
com/sun/deploy/uitoolkit/ui/AbstractDialog.class
com/sun/deploy/uitoolkit/ui/ComponentRef.class
com/sun/deploy/uitoolkit/ui/ConsoleController.class
com/sun/deploy/uitoolkit/ui/ConsoleHelper.class
com/sun/deploy/uitoolkit/ui/ConsoleTraceListener.class
com/sun/deploy/uitoolkit/ui/ConsoleWindow.class
com/sun/deploy/uitoolkit/ui/DialogHook.class
com/sun/deploy/uitoolkit/ui/LoggerConsole.class
com/sun/deploy/uitoolkit/ui/NativeMixedCodeDialog.class
com/sun/deploy/uitoolkit/ui/UIFactory.class
com/sun/deploy/util/ArgumentParsingUtil.class
com/sun/deploy/util/ArrayUtil.class
com/sun/deploy/util/BASE64EncoderWithoutLineBreaks.class
com/sun/deploy/util/Base64Wrapper.class
com/sun/deploy/util/BlackList.class
com/sun/deploy/util/BufferUtil.class
com/sun/deploy/util/DeployLock.class
com/sun/deploy/util/DeployRMIClassLoaderSpi.class
com/sun/deploy/util/DeploySysAction.class
com/sun/deploy/util/DeploySysRun.class
com/sun/deploy/util/DeployUIManager.class
com/sun/deploy/util/DeploymentHooks.class
com/sun/deploy/util/DialogListener.class
com/sun/deploy/util/FXLoader.class
com/sun/deploy/util/GeneralUtil.class
com/sun/deploy/util/IcoEncoder.class
com/sun/deploy/util/IconEncoder.class
com/sun/deploy/util/JVMParameterConverter.class
com/sun/deploy/util/JVMParameters.class
com/sun/deploy/util/JarUtil.class
com/sun/deploy/util/LinkMouseListener.class
com/sun/deploy/util/NativeLibraryBundle.class
com/sun/deploy/util/OrderedHashSet.class
com/sun/deploy/util/ParameterUtil.class
com/sun/deploy/util/PerfLogger.class
com/sun/deploy/util/Property.class
com/sun/deploy/util/ReflectionUtil.class
com/sun/deploy/util/SearchPath.class
com/sun/deploy/util/SecurityBaseline.class
com/sun/deploy/util/SessionProperties.class
com/sun/deploy/util/SessionState.class
com/sun/deploy/util/StringUtils.class
com/sun/deploy/util/SyncAccess.class
com/sun/deploy/util/SyncFileAccess.class
com/sun/deploy/util/SystemUtils.class
com/sun/deploy/util/TrustedLibraries.class
com/sun/deploy/util/TrustedLibrariesSyntaxException.class
com/sun/deploy/util/URLUtil.class
com/sun/deploy/util/UpdateCheck.class
com/sun/deploy/util/VersionID.class
com/sun/deploy/util/VersionString.class
com/sun/deploy/util/Waiter.class
com/sun/deploy/util/WinRegistry.class
com/sun/deploy/xml/BadTokenException.class
com/sun/deploy/xml/CustomParser.class
com/sun/deploy/xml/GeneralEntity.class
com/sun/deploy/xml/XMLAttribute.class
com/sun/deploy/xml/XMLAttributeBuilder.class
com/sun/deploy/xml/XMLEncoding.class
com/sun/deploy/xml/XMLNode.class
com/sun/deploy/xml/XMLNodeBuilder.class
com/sun/deploy/xml/XMLParser.class
com/sun/deploy/xml/XMLable.class

⇒ JRE 8 javaws.jar - Java Web Start

⇐ JRE 8 charsets.jar - Character Set Encoding

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)