Useful GMail Extensions

The following is a continually updated list of useful GMail extensions to help maximize productivity and classroom success

Dropbox or Box: Stop uploading files to Gmail if they're already on the cloud. Dropbox for Gmail and Box for Gmail let you browse and attach files from those two cloud storage services, meaning you can share files or entire folders with just a couple of clicks. This is particularly useful if you're using a Chromebook or mobile device, but even on your computer, it's nice to have direct access to your cloud storage. It's also possible to save email attachments directly to your cloud storage, saving you the trouble of downloading them only to re-upload so you can send a file in an email.
Trello: Want to quickly send the contents of an email over to Trello? Trello for Gmail makes it easy. Just open an email, click the Trello icon in the sidebar, then pick a destination board and list. By default the subject will be the card's name and the email body will become the description, but you can edit everything before sending it over to Trello. It's a simple integration, sure, but a useful one for project management.
Zoom: Sometimes a video or voice call can quickly settle something that would otherwise take five emails. Zoom for Gmail makes it easy to start a video conference with anyone that you're emailing. Just open an email, click the Zoom button in the sidebar, then send the invitation over to everyone in the thread. You can start the meeting immediately or schedule it for later. It's a handy tool, especially if everyone in your organization is using Zoom already.
Todoist for Gmail (Chrome): A lot of tasks begin and end with communication, so having your to do list handy while going through emails can help you get all your to dos in one place. Gmail offers built-in support for Google Tasks, but what if you prefer Todoist, one of the most popular to do apps on the planet right now? That's where Todoist for Gmail comes in. This browser extension adds Todoist to Gmail, in the form of a popup window that sites alongside any emails you're composing. Here you can quickly manage your tasks and even turn an email into a task in a couple of clicks. This is a must for anyone who uses both Gmail and Todoist, so install now if that's you.
Gmelius (Chrome): Gmelius is like a Swiss army knife for your inbox (and just happens to be made in Switzerland!) The list of features Gmelius adds to Gmail is impressive: schedule emails to send later, snooze messages to leave your inbox then return at a designated time, track email opens, add notes to emails, create email templates, block email trackers, automate copying contacts, automatically label outgoing emails, and more. These features all enhance Gmail, but perhaps Gmelius's best feature is the ability to customize Gmail's interface. You can replace the standard paperclip attachment icon, for example, with icons that quickly show what file type is attached. You can disable Google's ads. You can make Gmail always show the To, Cc, and Bcc fields. There’s a wealth of customization options here, so dig in.
Checker Plus for Gmail (Chrome): Chances are you have multiple Gmail accounts: perhaps one for work and one for personal use. Switching between those accounts in your browser can be a hassle. That's where Google Chrome extension Checker Plus for Gmail comes in. Click the Checker Plus icon in your browser extensions bar and you'll get easy access to all of your inboxes in one window. There you can manage all of your emails like you would in a dedicated tab for Gmail–read, archive, delete, or mark messages as spam, or even compose a new message or send a reply–no matter what page you're on. It's the quickest way to check emails without needing to have Gmail open.
Clearbit Connect (Chrome): Ever get an email from a stranger and wondered who that person is? Clearbit Connect can tell you. Or, maybe you're the stranger who needs to send cold emails to others. Clearbit Connect can help you there as well, helping you find email addresses by company, rather than having to hunt them down yourself. When you compose an email, click on the Clearbit icon to search company email addresses. Or, when viewing an email, Clearbit Connect will offer up in a sidebar some information about the sender and their company. It works as advertised and is a tool our marketing team at Zapier uses often.
Sortd (Chrome): Looking at one long list of email messages is neither inspiring nor encouraging. If you use your email inbox like a to-do list but want to get a better bird's eye view of what's ahead, check out Sortd. The Gmail add-on transforms your inbox into a Kanban board. (If you're not familiar with it already, Kanban is a popular project management method that gives you a holistic view of everything you're working on, with cards laid out in lists on a simple drag-and-drop board.) With Sortd, you can drag emails into custom lists for better organization. You might have lists that correspond to the GTD productivity philosophy, such as Next Actions and Someday/Maybe, or you might have special lists of your own. Either way, this is a better, visual way of sorting and grouping your emails at a glance.
HubSpot Sales (Chrome): Customer relationship management (CRM) tool HubSpot helps thousands of businesses manage their leads and turn them into users. With the HubSpot Sales Chrome extension, you can get that marketing power in your inbox. When viewing an email, for example, you can get more details about the sender, such as facts about the company they work for, and add the contact to HubSpot in one click. Save emails you send as templates for quickly responding to similar emails, see who has opened your emails, log emails in the HubSpot CRM by clicking a checkbox, and get other HubSpot sales features within Gmail without having to switch to another tab or app.
Mailstrom (Web): Got hundreds or even thousands of messages in your inbox weighing you down? You could declare "email bankruptcy," archive all those emails, and try to start over, but what if you miss some important ones? Mailstrom helps you quickly go through large batches of emails at once and deal with them once and for all. The app bundles related emails into different categories–such as time sent, email size, and sender–giving you more control than Gmail's standard filters.