The best replacement for instant client is oracle client.

The best alternatives to instant client are rated as following:
★★★★★  oracle client

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Speaking about instant client, one probably shouldn't forget about sqlplus.

Other search terms related to instant client and their ratings are:
★★★★★ sqlplus
★★★★★ tnsnames
★★★★ sqlldr
★★★ odac
★ tnsnames ora
★ toad
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