PyMCL

PyMCL is a multimc-like (functionality wise) launcher for legacy minecraft versions (1.5.2 and lower).

It looks like the old beta launcher, but has the same features as many modern launchers.

Features in Descending Order (priority)

This list is based off of the old beta launcher.
Changelog

• Fixed tumblr page.
• Themable for modpacks/personal needs.
• Extended options. (supports custom java args and ram limits right now)
• Instancing.
• Modpack manager.
• Fixed login.
• Discord integration.
• MultiMC instance support.
• Mod installer system similar to Nexus Mod Manager.
• Stupidly lightweight.

Compiling

You need Python 3.6+ (made on 3.7.2)
This assumes that you know the basics of script execution and dependency resolving on your OS.

Automated Compile:

Run the batch/shell file for your OS.

OSX:
Unix script works on OSX.
You will need to install pip and virtualenv first though.
Edit the script to use your python 3.6+ install and run it.

*Unix:
Should work. Untested.
Some distros come with python 2.7 installed. This uses python 3.6+, so install that.
Edit the script to use your python 3.6+ install and run it.

Windows Vista+:
Just run the compile script.

Manual Compile:

USE A VIRTUAL ENVIRONMENT
(python -m venv venv) then (venv/Scripts/activate)

get Pip 3, PyQt5, PyInstaller, Requests and AppDirs. (pip3 install pyqt5 appdirs pyinstaller requests)
Then use pyinstaller on the launcher:
pyinstaller -y -F -w -i favicon.ico --add-data "background.png":"." --add-data "favicon.ico":"." --add-data "logo.png":"." --add-data "blogbackground.png":"." --add-data "blog.html":"." launcher.py.

Notes:

• If pyinstaller errors out with invalid syntax, use a semicolon (;) instead of a colon (:) in the --add-data arguments.
• The compiled executable will be put in the dist folder when it is done.
• To have a console for the launcher, remove the -w in the compile arguments when compiling.
• The final file is pretty big. (~40mb)