Audacity
Free, open-source, cross-platform audio software. Use for podcasting, video and animation audio. Audacity is an easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. Developed by a group of volunteers as open source.
iSkySoft
Media Converter. Converts, edits, burns and compresses video (for Windows). It converts any video and audio format. Makes video editing easy.
Mpeg StreamClip
High-quality converter for MPEG files and transport streams. It works as an editor, converter and player. It supports almost any video format and can export converted files to any format of your choice.

Stock Audio Libraries

Bensound
There are some free tracks available for download. You can also subscribe and download any track from the entire library, including tracks only available for purchase, and all new tracks during one year in both mp3 and wav format.
Motion Array
Royalty-Free music and sound effects. Motion Array is generally a paid repository, for filmmakers with tones of templates and pre-designed element, but they do have a good range of free sound effects available for download.
Pond5
Royalty-Free music and sound effects. Music for Every Project. Royalty-free stock music, now with expanded licensing rights. Rates starting at $15. There are some free tracks available too.
Free Music Archive
We welcome all creators around the world to search, find and use music from our websites in their projects. The options: If your project has no budget check out SEARCH FMA and make sure you respect and follow the (CC) licensing conditions.
Freesound
Freesound is a collaborative database of Creative Commons Licensed sounds. You can browse, download and share sounds on this platform.
Soundcloud
Soundcloud is sometimes forgotten, but it is a great source of audio. Most of the music on SoundCloud is licensed under Creative Commons, which means that you are free to use the tracks as long as you follow the guidelines established by the artist.
Epidemic Sound
Music subscriptions for content creators. Covered for social media, online platforms and websites.
Audio Blocks
Unlimited Royalty-Free Music & SFX Download all the music, sound effects, and loops you need with a low-cost subscription.
Audio Jungle
Royalty free music and audio tracks from $1 1,216,265 tracks and sounds from our community of musicians and sound engineers.
Jamendo
Royalty free music and audio tracks
Free Play Music
Royalty free music and audio tracks for personal use only on YouTube, are really good deal - you’ll be able to access nearly all of their tracks for free. For businesses with a wide variety of music needs such as a video, advertisement you need a subscription.