Hope I’m not violating any rules here. I’ve created an Android app for Chinese pronunciation practice. All user interactions are voice-based, therefore it can be used while driving or cycling or just at home.
Here is the link to Google Play: https://play.google.com/store/apps/details?id=com.rnk.handsfree.chinese.handsfreechinesemandarintonesandsounds
For a limited time (one week, starting from tomorrow) I’m offering a 50% discount.