Democratic presidential candidate Hillary Clinton speaks during a press conference at Des Moines Area Community College in Ankeny, Iowa, Aug. 26, 2015. REUTERS/Scott Morgan/Files

Emails, and how secure they are, have become a hot topic this election season, given the controversy surrounding Democratic presidential nominee Hillary Clinton's use of a private server while she was secretary of state. While the FBI has said (again) it will not bring any charges against her, her Republican rival Donald Trump has raked up the issue often.

However, there are alternatives to email that Clinton could have used to keep things private instead of the server she used. Here are five of them.

1. Microsoft Teams

It is the newest email alternative and is included in the Office 365 suite. Employee teams can create “channels” to collaborate on projects. It also offers support for Microsoft's other software, such as Skype. It lets you schedule a meeting in advance and invite people by just clicking the video icon to get things started. Meetings are video by default, but you can also use just audio.

For businesses primarily relying on Microsoft products, Microsoft Teams offers seamless integration. It also offers a built-in text editor.

2. Slack

Slack is one of the most popular messaging platforms for workgroups. It obliterates emails and lets users create multiple channels pertaining to various conversation threads. Users can also receive notifications when their name is mentioned by others. The app also offers a Direct Messaging (DM) option and it can be connected to other apps such as Twitter.

3. Bitrix 24

Bitrix doesn't have Slack's feature of exporting chat history, but it offers solo and group video calls, an independent social network for collaboration, syncing across devices, and edit notifications. It has an advantage over Slack as it offers shared calendars, tasks and to-dos for project management. It also offers a self-hosting version for corporate consumers.

4. Yammer

Yammer calls itself an “enterprise social network service”. It lets users set up groups for individual topics or projects and use these groups to share files. It also integrates Microsoft Office apps which could be great help for users transferring documents.

5. Fuze

Fuze offers internal communication experience over desktop and mobile devices. It lets users make HD video calls and video conferencing. It can run multi-party video, duplex audio and integration with tools such as Microsoft Outlook, Lync, Google Calendar and Box.