HelloSign is a tool for helping you to get event contracts (and other types of contract) signed by requesting electronic signatures from up to 20 different people. It uses SSL encryption to keep documents safe, and will send out an email copy to everyone who signed a document, for their records. The free version is limited to 3 documents per month from a single sender; paid versions start from $13/month and have a 30-day free trial.
Very impressive and comprehensive list you’ve compiled here, Pawan! If I could make a suggestion, check out DrumUp-employee advocacy platform, social media management and content curation and scheduling tool. It also has a built-in analytics feature for your social media activity and employee advocacy program. If you find it interesting, do consider adding it to you list 🙂

With digital marketing it is much easier to measure results. You will be able to monitor everything from how long someone spent on your web page to where that person came from on the internet to get to your website. You can monitor how well your ads are doing and make quick adjustments when they are under-performing. This is why digital marketing has so much power. Every action that your customers take can be recorded, and that data can be used to form a successful digital marketing campaign.
By default, extract-key is applied to two list elements for every comparison, but if cache-keys? is true, then the extract-key function is used exactly once for each list item. Supply a true value for cache-keys? when extract-key is an expensive operation; for example, if file-or-directory-modify-seconds is used to extract a timestamp for every file in a list, then cache-keys? should be #t to minimize file-system calls, but if extract-key is car, then cache-keys? should be #f. As another example, providing extract-key as (lambda (x) (random)) and #t for cache-keys? effectively shuffles the list.