Some alternatives to Google AdSense for online advertising include:
1. Media.net: Offers contextual ad solutions similar to AdSense.
2. AdThrive: Focuses on premium advertising and has a high entry requirement.
3. PropellerAds: Provides various ad formats and works well for both desktop and mobile traffic.
4. Infolinks: Offers in-text and in-frame ads for publishers.
5. Amazon Associates: Ideal for those focusing on affiliate marketing through Amazon products.
Remember, the effectiveness of these alternatives can vary based on your website’s content and audience. Always review and adhere to the policies of any advertising platform you consider.