# This is a post about some good open source tools under Linux.

I think it will continue updating because I may find more good tools in my using.

### Gimp

Gimp is a powerful tool of graph processing, it includes many functions, I think if you are not very professional, it can replace of Adobe Photoshop. If you are familiar with Photoshop, it is not hard to study it.

### Inkscape

Inkscape is also a powerful tool, but it is for processing vector drawings. You can translate bitmap to vector by path scanning, or directly draw it by the tools like Bezier curves or other, and you can also do union, intersection and many other operations to paths. I haven’t been used Adobe Illustrator, but I think their function may be similar.

### ImageMagick

ImageMagick is a commandline tool, it nearly have no graphic interface, so it may be difficult to use at first. However, it can accurately cut, draw and do other operations by the coordinate, and it’s also convenient to do some simple operations, such as reverse the color, convert the format, make a gif with many pictures and so on, I usually use these commands, but if I need to do some complex operations, I will change to other tool considering the time cost (I need to look up the manual or Google to get the command arguments, it may be time costing). I have a repository called ImageMagick-note, there are arguments of a few simple operations.

This is an example of adding background:

 origin after

## About graph viewing and managing

### nomacs

Nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and PSD images.

It’s the best graph viewer I have used, you cannot only view graph, you can also do some simple editing, rename, check the meta information and other operations. You can paste the image from clipboard, then edit and save. It has the function of action synchronization, you can synchronize your action and edit in multiple instances, even in other machines though LAN. I think it’s one of the best image viewers in Linux. However, it didn’t have the function of copy by dragging, I think this function is useful.

It also have a function which is openning the file with other applications, and then I can combine it with gimp, inkscape, even qr-filetransfer (by script file), and which can make it more convenience when managing photos.

### Flameshot

Flameshot is also a powerful screenshot tool in Linux. It can do simple editing after shot, these include drawing lines, arrows, frames, and blurring, highlighting and so on. New version add the text adding function, I think it’s convenient.

This is the result:

Animation:

## 3D modeling

### Blender

Blender is a powerful 3D modeling software in Linux. It can establish the 3D model, and then render a photo by the camera tool, or you can also make an animation, it even has the function of video editing. It approves multiple formats, like OBJ, DAE and others. It has many functions, so it may a little hard to learn, if you are new to 3D modeling, you can watch teaching videos in YouTube, it may amaze you.

### Evince

Evince is a component of GNOME, so it’s a good choice if you use GNOME desktop environment. It’s fast and light, you can view pdf or djvu fluently. You can add bookmarks, mark in the document, and you can also play slides in pdf format … Evince will cache the index of documents recently opened, so you can find recently opened documents soon.

## Editing

### Vim

Vim is a traditional editor in unix, and there are alway arguments between vim users and emacs users, because I’m a vim user, not a emacs user, I recommend vim only. Vim’s keys are convenient, you can move your without moving your hand away from main part of keyboard; some commands can make you easily find the position you want to edit; it’s very convenient to find and replace with regular expression … It’s very light, and you can directly use it in your terminal. (vim have a GUI version called gvim) However, it maybe a little old, and it’s not convenient to install plugins, finding a suitable plugin may cost a lot of time. It’s still convenient to edit small files, such as code with hundreds of lines and so on.

### Visiual Studio Code

Visual Studio Code is a project of Microsoft, and Microsoft made it open source. It’s a powerful editor, its completion is good and it is easy to manage plugins. When I need a plugin, I only need to switch to the plugin tag, search, and install. For convenience, I installed vim plugin and use vim keys. You can call out the shell, and do some operations on it directly …

## Planetarium

### Stellarium

Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.

It’s a good planetarium software, you can show asterisms, watch in telescope view, adjust the speed of time, and it has a big database, which include catalogue of over 600,000 stars, extra catalogues with more than 177 million stars and so on.

These are screenshots: