Open Broadcaster Software (OBS)

Open Broadcaster Software is free and open source software for video recording and live streaming. Supported features include:

-Encoding using H264 (x264) and AAC.
-Support for Intel Quick Sync Video (QSV) and NVENC.
-Unlimited number of scenes and sources.
-Live RTMP streaming to Twitch, YouTube, DailyMotion, Hitbox and more.
-File output to MP4 or FLV.
-GPU-based game capture for high performance game streaming.
-DirectShow capture device support (webcams, capture cards, etc).
-Windows 8 high speed monitor capture support.
-Bilinear or lanczos3 resampling.