SoundEffects 2.1.2 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The software relates to Audio & Video Tools. The actual developer of this free Mac application is TMSOFT, LLC.
From the developer:
Sound Effects is a sound machine that lets you add sound effects to any moment. Therefore, the tool can play sound effects for every occasion with an easy-to-use soundboard that supports full customization. It is perfect for podcasters, radio DJs, or just for having fun.
You may want to check out more software for Mac, such as Stomp, Guitar Tuner or ReduxEncoder, which might be related to SoundEffects.