FrugalBot is described as 'delivers straightforward metrics for customers to measure the effectiveness of AWS Cloud optimization effort. From Cost Optmization to Continuous Cost Optimization (CCO)'. There are four alternatives to FrugalBot, not only websites but also apps for SaaS. The best alternative is Firemon, which is free. Other great sites and apps similar to FrugalBot are GorillaStack (Freemium), cloudability (Paid) and CloudCheckr (Paid).
Firemon lets you gain control of your Google Firebase usage costs. Get your monthly costs in an easy to use dashboard with custom created threshold alerts via the channel that is most convenient to you.
Manage your AWS cloud using GorillaStack's toolset. Take greater control over your billing and usage with Power Cycle, Power Scale and Alerts. Power Cycle - turn your EC2 instances on and off by schedule to avoid wastage.