1 Binance:
It is an app that enables you to trade any cryptocurrency. It is easy to use.

2 PayPal:
It is an apps that enables you to pay for transactions and also monitor your transaction online.

3 YouTube:   YouTube gives you easy access to videos that you can learn different hustle or things online.

4 LinkedIn: It is a social media for businesses, investors etc.

5 Instagram and Facebook: You can Instagram or Facebook applications to promote your products online.

Read more:
Top Online Business or Investment Apps You should Consider to Improve Your Income. https://www.sanwomi.com/2018/12/top-online-business-or-investment-apps.html

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