One of the best is Tag Parrot. This automated website indexing service offers a variety of features, including one-click bulk indexing, auto-indexing, daily email reports and live indexing status updates. It supports several platforms, including Wix, Gatsby, Next.js and others, and has flexible pricing options.
Another good option is RankWeek, which can help you ensure your pages are indexed frequently by monitoring crawl problems and resubmitting pages for indexing. It also monitors sitemaps daily and offers autopilot that lets you resubmit specific pages for indexing automatically. RankWeek is geared for website owners and SEO professionals, and offers several pricing tiers including a free option.
If you're looking for something simple and inexpensive, check out INDEXED.pro. The service integrates with Google Search Console to automate indexing and deindexing of URLs. It offers fast and bulk URL indexing and real-time status monitoring, and lets you make up to 1000 requests per day per site. It's easy to set up and has flexible pricing options.