iZotope RX Elements
OFFICIAL PAGE: iZotope RX Elements
iZotope RX Elements is a very affordable audio editor which includes spectral editing. iZotope RX Elements includes four essential, real-time noise reduction plug-ins to fix clipping, hums, clicks, and unwanted background noise. The latest version of RX Elements includes an improved De-hum tool. The Intelligent Repair Assistant can detect noise, clipping, clicks, and more, and then offer different processing options to repair your content. You can review and audition each option and select what works best for you. iZotope RX Elements is available for both macOS and Windows. System requirements are available at the official page.
Screenshots courtesy of iZotope
ONLINE RX HELP DOCUMENTATION: