The best replacement for modloader is minecraft forge.

The best alternatives to modloader are rated as following:
★★★★★  minecraft forge
★★★  mcpatcher
★★  forge
★★  forge better
★  fml
★  magic launcher

Your alternative for modloader is not listed? Suggest!
Speaking about modloader, one probably shouldn't forget about forge.

Other search terms related to modloader and their ratings are:
★★★★★ forge
★★★★★ optifine
★★★★ bukkit
★★★ magic launcher
★★★ mcp
★★ mcpatcher
★ minecraft forge
You have in mind a companion for modloader and it is not yet here? Propose!



Google Trends

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modloader
minecraft forge
mcpatcher