user6219: I plan to create some homemade video lectures and I am under Linux. Is there comfortable open-source tool that has the following abilities:

to clear noise
to have a few sound channels
to allow adding a slide screen in part of the video screen
to add titles and labels over the footage
to have simple effects

Thanks in advance.

user6210: Blender has video editing options, and of course, it is free. Check it out.

user3295: There are a lot of answers regarding open source on this answer: Good open source Video Editors?
If you specifically target Linux I'd suggest Lightworks or Kdenlive. Lightworks isn't open source yet but is announced to be after the mac release is finished.
Both a great option for video editing under Linux and fullfill your requirements. Lightworks has only one downside, that being you need to register it on the first start with a free Lightworks account. After that you don't have to connect to the internet again.
If OpenSource is the most important factor I suggest to go with Kdenlive.

6219: <p>I plan to create some homemade video lectures and I am under Linux. Is there comfortable open-source tool that has the following abilities:</p>

<ul>
<li>to clear noise</li>
<li>to have a few sound channels</li>
<li>to allow adding a slide screen in part of the video screen</li>
<li>to add titles and labels over the footage</li>
<li>to have simple effects</li>
</ul>

<p>Thanks in advance.</p>
 6210: <p><a href="http://www.blender.org/" rel="nofollow">Blender</a> has video editing options, and of course, it is free. Check it out.</p>
 3295: <p>There are a lot of answers regarding open source on this answer: <a href="https://video.stackexchange.com/questions/2274/good-open-source-video-editors">Good open source Video Editors?</a></p>

<p>If you specifically target Linux I'd suggest <a href="http://www.lwks.com/" rel="nofollow noreferrer">Lightworks</a> or <a href="http://kdenlive.org/" rel="nofollow noreferrer">Kdenlive</a>. Lightworks isn't open source yet but is announced to be after the mac release is finished.</p>

<p>Both a great option for video editing under Linux and fullfill your requirements. Lightworks has only one downside, that being you need to register it on the first start with a free Lightworks account. After that you don't have to connect to the internet again.</p>

<p>If OpenSource is the most important factor I suggest to go with Kdenlive.</p>
