[Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot] Sezmar:
Here is a complete list that is safe to remove, including KNOX.

/system/app/Chrome.apk

/system/app/ChromeBookmarksSyncAdapter.apk

/system/lib/libchromeview.so

/system/app/SBrowser.apk

/system/app/SBrowser.odex

/system/app/SBrowserTry.apk

/system/app/SBrowserTry.odex

/system/app/sCloudSyncSBrowserBookmark.apk

/system/app/sCloudSyncSBrowserTabs.apk

/system/app/AccuweatherPhone2013.apk

/system/app/AccuweatherPhone2013.odex

/system/app/WeatherWidgetDaemon.apk

/system/app/WeatherWidgetDaemon.odex

/system/app/SHealth2.apk

/system/app/HealthContentProvider.apk

/system/app/SensorService.apk

/system/lib/libhealth_jni.so

/system/lib/libBarcodeDecoderPacked.so

/system/lib/libload_strings.so

/system/app/S-Voice_Android_phone_J.apk

/system/lib/libchatbotfilter.so

/system/lib/libsvoxtts.so

/system/app/SamsungTTS.apk

/system/app/Earth.apk

/system/lib/libearthmobile.so

/system/lib/libearthandroid.so

/system/app/PolarisViewer5.apk

/system/lib/libpolarisviewer5.so

/system/lib/libpolarisofficedump.so

/system/lib/libpolarisviewer5.so

/system/lib/libpolarisexternel.so

/system/lib/libpolarisexternel3.so

/system/lib/libpolarisexternel3SDK.so

/system/lib/libpolarisexternelSDK.so

/system/lib/libpolaristextprint5v.so

/system/lib/libpolarisviewerSDK.so

/system/app/Talk.apk

/system/lib/libgtalk_jni.so

/system/lib/libvideochat_jni.so

/system/app/ChatON_feature.apk

/system/app/ChatONV_J.apk

/system/lib/libChatOnAMSImageFilterLibs-1.0.2.so

/system/app/FaceLock.apk

/system/lib/libfacelock_jni.so

/system/vendor/pittpatt

/system/app/ColorBlind.apk

/system/app/ColorBlind.odex

/system/app/DioDict3Service.apk

/system/app/EasyFavoritesContactsWidget.apk

/system/app/EasyFavoritesContactsWidget.odex

/system/app/EasyLauncher.apk

/system/app/EasyLauncher.odex

/system/app/EasySettings.apk

/system/app/EasySettings.odex

/system/app/Street.apk

/system/app/KNOXAgent.apk

/system/app/KNOXAgent.odex

/system/app/KLMSAgent.apk

/system/app/KLMSAgent.odex

/system/app/KnoxAttestationAgent.apk

/system/app/KnoxAttestationAgent.odex

/system/app/KNOXStore.apk

/system/app/KNOXStore.odex

/system/app/ContainerAgent.apk

/system/app/ContainerAgent.odex

/system/lib/libknoxdrawglfunction.so

/data/data/com.sec.knox.seandroid

/data/data/com.sec.knox.store

/data/data/com.sec.knox.containeragent

/data/data/com.sec.enterprise.knox.attestation

/data/data/com.sec.knox.app.container

/data/data/com.sec.knox.eventsmanager

/data/data/com.samsung.klmsagent

/data/data/com.samsung.android.walletmanager

/data/clipboard/knox

/system/etc/secure_storage/com.sec.knox.store

/system/app/MobilePrint2.apk

/system/app/MobilePrint2.odex

/system/app/MobilePrintSvc_CUPS.apk

/system/app/MobilePrintSvc_CUPS_Backend.apk

/system/app/MobilePrintSvc_Epson.apk

/system/app/MobilePrintSvc_HP.apk

/system/app/MobilePrintSvc_Samsung.apk

/system/lib/libescpr.so

/system/lib/libhpbsnmp.so

/system/lib/libhpcurl.so

/system/lib/libhpexpat.so

/system/lib/libhpmpcrypto.so

/system/lib/libhpmpssl.so

/system/lib/libimage.so

/system/lib/libSamsungPDLComposer_MD2.so

/system/lib/libwprint.so

/system/lib/libwprintplugin_pcl.so

/system/lib/libwprintSupport.so

/system/app/PageBuddyNotiSvc2.apk

/system/app/PageBuddyNotiSvc2.odex

/system/app/MusicLiveShare.apk

/system/app/MusicLiveShare.odex

/system/app/PlusOne.apk

/system/app/S_Translator_CSLi.apk

/system/app/S_Translator_CSLi.odex

/system/app/SamsungVideo.apk

/system/app/SimpleWidget.apk

/system/app/SimpleWidget.odex

/system/app/SmartBriefing4x2.apk

/system/app/SmartBriefing4x2.odex

/system/app/SNS.apk

/system/app/talkback.apk

/system/app/WebManual.apk

/system/app/WebManual.odex

/system/app/GoogleSearchWidget.apk

/system/app/GoogleSearchWidget.odex

/system/app/CHS_J_Device_only.apk

/system/app/Com2usPoker_ASGC.apk

/system/app/Dropbox.apk

/system/app/DropboxOOBE.apk

/system/app/Episodes.apk

/system/app/Episodes.odex

/system/app/Flipboard.apk

/system/app/GoogleFeedback.apk

/system/app/GroupPlay_20.apk

/system/lib/CollageEngine.so

/system/lib/libmagnet.so

/system/app/InteractiveTutorial.apk

/system/app/InteractiveTutorial.odex

/system/app/Magazines.apk

/system/app/Match3VS.apk

/system/app/Music2.apk

/system/app/Peel.apk

/system/app/PlusOne.apk.apk

/system/app/S_Translator_CSLi.apk.apk

/system/app/SamsungApps_J_Only.apk

/system/app/SamsungAppsUNA3.apk

/system/app/SamsungBooks.apk

/system/app/SamsungGames.apk

/system/app/SamsungHub.apk

/system/app/SamsungHubUpdater.apk

/system/app/SamsungLearning.apk

/system/app/SamsungMusic.apk

/system/app/SamsungWatchON.apk

/system/app/AllSharePlay15.apk

/system/app/TravelWidget.apk

/system/app/TravelWidget.odex

/system/app/TravelService.apk

/system/app/TravelService.odex

/system/app/TripAdvisor.apk

/system/app/YahoostockPhone2013.apk

/system/app/YahoostockPhone2013.odex

/system/app/YahoonewsPhone2013.apk

/system/app/YahoonewsPhone2013.odex

/system/app/Blurb.apk

/system/app/Books.apk

/system/app/StoryAlbumWidget.apk

/system/app/StoryAlbumWidget.odex

/system/app/Gmail2.apk

/system/app/secRCS.apk

/system/app/secRCS.odex

/system/app/Videos.apk

/system/app/SPDClient.apk

/system/app/SPDClient.odex

/system/app/SyncmlDM.apk

/system/app/SyncmlDM.odex

/system/app/SyncmlDS.apk

/system/app/SyncmlDS.odex

/system/app/FotaClient.apk

/system/app/FotaClient.odex

/system/lib/libdprw.so

/system/app/DSMForwarding.apk

/system/app/DSMForwarding.odex

/system/app/DSMLawmo.apk

/system/app/DSMLawmo.odex

/system/app/ELMAgent.apk

/system/app/ELMAgent.odex

/system/app/BluetoothTest.apk

/system/app/BluetoothTest.odex

/system/app/WlanTest.apk

/system/app/WlanTest.odex

/system/app/wssyncmlnps.apk

/system/app/wssyncmlnps.odex

/system/app/AlarmWidget.apk

/system/app/AlarmWidget.odex

/system/app/MusicFX.apk

/system/app/MusicFX.odex

/system/app/MusicPlayerWT.apk

/system/app/MusicPlayerWT.odex

/system/app/NoiseField.apk

/system/app/NoiseField.odex

/system/app/PhaseBeam.apk

/system/app/PhaseBeam.odex

/system/app/SamsungWidget_ProgramMonitor.apk

/system/app/SamsungWidget_ProgramMonitor.odex

/system/app/SecVideoList.apk

/system/app/SecVideoList.odex

ui_print("Deleting Android 4.3 Stuffs...

/system/app/AntHalService.apk

/system/app/AntHalService.odex

/system/app/ANTPlusPlugins.apk

/system/app/ANTRadioService.apk

/system/app/MusicLiveShare2.apk

/system/app/MusicLiveShare2.odex

/system/app/GroupPlay_25.apk

/system/app/Hangouts.apk

/system/app/ContainerEventsRelayManager.apk

/system/app/ContainerEventsRelayManager.odex

/system/app/Kies.apk

/system/app/Kies.odex

/system/app/KNOXStub.apk

/system/app/MobilePrint3.apk

/system/app/MobilePrint3.odex

/system/app/MobilePrintSvc_WFDS.apk

/system/app/PlayGames.apk

/system/app/S-Voice_Android_phone_H.apk

/system/app/SamsungContentsAgent.apk

/system/app/SamsungLearning.apk

/system/app/SamsungLink18.apk

/system/app/SamsungMusic10.apk

/system/app/SamsungWallet_Stub.apk

/system/app/SamsungWidget_ActiveApplication.apk

/system/app/SamsungWidget_ActiveApplication.odex

/system/app/SensorService2_5.apk

/system/app/SHealth2_5.apk

/system/lib/libDioDict3EngineNativeService.so

/system/lib/libDioDict4EngineNativeService.so

/system/lib/libDioOcrEngine.so

ui_print("Deleting folders and misc...

/system/media/video

/system/containers

/system/lost+found

/system/preloadedkiosk

/system/preloadedsso

/system/opticalreader

/system/voicebargeindata

/system/etc/kies

/system/tts/lang_SVOXP

/data/dalvik-cache

/cache

Only remove what you do not use...

Just reboot after you remove, no need to go into recovery and clear cache and dalik-cache.