Hi, if you wanna to make your own MCP for example 1.14.3 this links and programs can be really helpful for you.
modcoderpack.com - Official site width links to download MCP
freethemice Fot idea setup tutorial - Tutorial how to set up MCP with Intel IDEA
Pokechu22 tutorial - Tutorial how to get mapping, SRG's etc. for your version
ThisTestUser program MCPFixer and tutorial - Program and tutorial with fixes for MCP from 1.13.x to 1.14.x
optifinesource.co.uk - Website with Optifine SRC from 1.7.x to 1.12.x (Not working anymore)
optifine.szymex.pw - Backup of OptifineSource by Hexeption
4thdimensiontraveler tutorial - If your version of Minecraft doesn't have SRC on link up this tutorial help you to get one.
http://mcp.llbit.se/ - Old versions of MCP
Luyten4Forge - Useful program if you want add code from some mod
@freethemice Fot @Pokechu22 @ThisTestUser @Hexeption @4thDimensionTraveler @KevinPriv