The best replacement for current source is voltage source.

The best alternatives to current source are rated as following:
★★★★★  voltage source
★★★★  current sink
★★  sink
★  current mirror

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Speaking about current source, one probably shouldn't forget about mosfet.

Other search terms related to current source and their ratings are:
★★★★★ mosfet
★★★★★ capacitor
★★★★ lm317
★★★★ resistor in series
★★★ op amp
★★★ parallel resistor
★★★ opamp
★★ bjt
★★ diode
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current source
voltage source
current sink