There’s a variety of easy-to-use video mergers and some simple editing tools that can help out.
Clideo: A Simple Online Tool
Streamlines the process to only the most basic steps.
Automatically handles many of the options in other apps.

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Uploading and downloading large clips can take ages.
Default compression option can’t be changed.
Clideo is a free web-based tool for joining multiple video clips.

Created by Alexander Fox
It has no real options to speak of, other than to add audio.
It’s available in all desktop and mobile browsers without installing any software.
Created by Alexander Fox
Free Instant Cutter makes combining videos a snap.

Created by Alexander Fox
Well-designed interfaces simplify a complex process.
Great variety of stock audio and transitions in the full editor.
Watermarked free videos without a paid upgrade.

Created by Alexander Fox
In the full-featured mode, videos can be downloaded from the web or recorded on your screen.
Select your videos and export.
Editing tools are effective and useful.

Created by Alexander Fox
The paid version is expensive.
Prominent watermark makes trial version less useful.
Basic options allow for adjusting quality slightly.

Created by Alexander Fox
A seven-day free trial is available, and a paid license can be obtained for use beyond one week.
All videos processed with the free version will be watermarked.
MPEG Streamclip: Supports Many Formats
High-quality conversion engine with many file formats.

Created by Alexander Fox
Video merging is rudimentary at best.
Clips cannot be moved or reorganized.
MPEG Streamclip is free, open-source software intended to convert single videos.

Created by Alexander Fox
It can also be used to merge files, but it’s not apparent.
Open more than one video by using the menu options.
This will automatically concatenate the files in alphabetical order.

Created by Alexander Fox
As a result, MPEG Streamclip’s video merging tools are incredibly rudimentary at best.
To organize video files, it’s best to rename the files with numbers before opening.
Input and output options are broad, with detailed prefs.
HD Video Converter Factory: Balanced Complexity and Power
Covers all the basics without undue complications.
Simple editing tools are included.
Batch processing unavailable in the free version.
Videos can be imported from your local storage or downloaded from YouTube within the system.
Clips can be trimmed or cropped before converting.
Download For:
iMovie: An Excellent Free Option for Apple Users
Capable and flexible interface.
Huge collection of editing tools and effects.
Limited export and sharing options.
Only available on Apple devices.
iMovie is likely the most accessible non-linear video editing tool on the market.
You’ll find the complete palette of video editing tools as well.
InShot: A Snapchat-style Merger For Social Media
Unique features like stickers and aspect ratio merging.
Music from Apple Music can be added to videos.
Expertly constructed interface that avoids cluttering your screen.
Apart from effects, export options are limited.
A recurring subscription model for Pro features.
InShot stands out by handling mixed video aspect ratios very elegantly.
Impressively zippy, smooth interface.
An unparalleled selection of mobile editing tools.
Circle-based file picker makes it hard to see clips.
Videos can only be added or removed in the first step.
You’ll also find music, transitions, crop, titles, speed, filters, etc.
Share videos using the custom export dialog or the system share sheet when you’re finished.