World report on Vision by World Health Organization reported that there are at least 2.2 Billion people are Visually Impaired. "The National Blindness & Visual Impairment Survey India 2015-2019" survey report by Government of India reported that the overall estimated prevalence of the Blindness in age 50 or more is 1.99% and the overall estimated prevalence of Visually Impaired in age 50 or more is 13.76%. The above numbers urge researchers to develop advanced assistive tools for Blind and Visually Impaired. There have been several assistive tools already designed to assist and enhance the quality of life to Blind and Visually Impaired. But most of them are limited and confined to specific problems. In this paper, a systematic review of some of the assistive tools for Blind and Visually Impaired is done. The detailed review of existing assistive tools reveals that the factors like user-friendly, ensuring safety, independent mobility, multiple features and user-centric design need priority consideration while designing such tools.

An effort bag (BoT) model that can be placed on distributed grid, cluster, and cloud structures can handle many concurrent records and responsibilities presentations. An unexpected consideration for clouds is AutoBoT, a collection of BoT arrangement strategies on Cloud Virtual Machines (VMs) with tight time constraints. Adding preemptible spot-priced VMs to low-priced, constant-fee VMs, AutoBoT lowers costs in a unique way by suggesting time-varying, riskier, and more expensive, but cheaper, VMs. Runtime decisions on VM valuation, gathering and releasing, and development placement, point check-out and relocation are made at the right time in order to achieve timely glory. Using the Google cluster's workload and six months of Amazon EC2 pricing data, we propose to run 7 million BoT simulations to compare AutoBoT against baseline techniques. Losses and pointing control approaches are studied in relation to the impact of different BoT sizes, data facilities, intervals of time, closure dates, and prices. With AutoBoT, you can expect to see savings of up to 80% on average, with only a few, uncommon drawbacks. The 100% full guarantee, on the other hand, is 23%/42% more expensive than employing the most powerful spot-priced VMs with a similar advantage.

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