Audacity is a multi-track audio and sound editor. It can also record from various input devices, up to 24bit wavelength, using ALSA or JACK with latencies up to 384kHz. All common audio formats and encodings such as WAV, AIFF, AU, FLAC, OGG Vorbis, GSM, MP2, MP3, AC3, M4A/M4R (AAC) and WMA are supported. Audio layers allow cutting, editing, and applying or layering a wide range of effects. And Audacity is also cross-platform.
Pitivi is a unique video editor suited for newcomers and professionals. It features hundreds of animated effects / filters / transitions, any GStreamer-supported video file and encoding format, realtime editing, is framerate-independent and very precise, audio processing and volume normalization, Gnome and GES-integration, and allows reliable background processing and has built-in backup functionality.